diff --git a/release_mixin.py b/release_mixin.py
index 4b8dc38..b31e838 100644
--- a/release_mixin.py
+++ b/release_mixin.py
@@ -30,29 +30,24 @@ class ReleaseMixin(DevopsBuild):
         self.config_file = release_mixin_config['config_file']
         self.main_branch = release_mixin_config['main_branch']
         self.version_repo = VersionRepository(self.config_file)
+        self.git_repo = GitRepository()
         self.release_version = None
         self.bump_version = None
         self.commit_string = None
 
-    def init(self):
+    def init_release(self):
         init_service = InitReleaseService(self.version_repo)
         self.release_version = init_service.create_release_version(self.commit_string)
         self.bump_version = self.release_version.create_bump_version()
 
-    def prepare(self, version):
-        git_repository = GitRepository()
-        if self.main_branch not in git_repository.get_current_branch():
-            raise Exception('Trying to release while not on main branch')
+    def prepare_release(self):
+        prepare_release_service = PrepareReleaseService(self.version_repo, self.config_file, self.main_branch)
+        if self.release_version is None or self.bump_version is None:
+            raise Exception('prepare_release was called before init_release')
         
-        self.version_repo.write_file(version.get_version_string())
-        git_repository.add_file(self.config_file)
-        match version.release_type:
-            case None:
-                raise Exception('Release type not set but trying to commit.')
-            case ReleaseType.BUMP:
-                git_repository.commit(f'Version bump')
-            case _:
-                git_repository.commit(f'Release {version.get_version_string()}')
+        # prepare_release_service.run_tests() # not implemented
+        prepare_release_service.write_and_commit_release(self.release_version)
+        prepare_release_service.write_and_commit_bump(self.bump_version)
 
     def tag_and_push(self, version):
         git_repository = GitRepository()
diff --git a/services.py b/services.py
index 212f016..04eac74 100644
--- a/services.py
+++ b/services.py
@@ -1,3 +1,4 @@
+from pathlib import Path
 from version_repository import VersionRepository
 from release_type import ReleaseType
 from git_repository import GitRepository
@@ -31,28 +32,28 @@ class InitReleaseService():
 
 class PrepareReleaseService():
 
-    def __init__(self, version_repo: VersionRepository):
-        self.version_repo = version_repo
-
+    def __init__(self, version_repository: VersionRepository, git_repository: GitRepository, config_file: Path, main_branch: str):
+        self.version_repository = version_repository
+        self.git_repository = git_repository
+        self.main_branch = main_branch
+        self.config_file = config_file
 
     def run_tests(self): # maybe auto?
-        pass
-
-    def prepare_release(self, version: Version):
-        # self.version_repo.write_file(version.get_version_string()) # side effect
-        pass
-
-    def prepare_bump(self, version: Version):
-        # self.version_repo.write_file(version.get_version_string()) # side effect
-        pass
-
-    
-    # write
-    
-    
-    # add
-    # commit
-    pass
+        raise NotImplementedError
+
+    def __write_and_commit_version(self, version: Version, commit_message: str):
+        if self.main_branch != self.git_repository.get_current_branch():
+            raise Exception('Trying to release while not on main branch')
+        
+        self.version_repository.write_file(version.get_version_string())
+        self.git_repository.add_file(self.config_file)
+        self.git_repository.commit(commit_message)
+
+    def write_and_commit_release(self, release_version: Version):
+        self.__write_and_commit_version(release_version, commit_message=f'Release {release_version.get_version_string()}')
+
+    def write_and_commit_bump(self, bump_version: Version):
+         self.__write_and_commit_version(bump_version, commit_message=f'Version bump')
 
 class TagAndPushReleaseService():
     pass
diff --git a/test/test_release_mixin.py b/test/test_release_mixin.py
index 4b129c6..67b25a9 100644
--- a/test/test_release_mixin.py
+++ b/test/test_release_mixin.py
@@ -56,7 +56,7 @@ def test_release_mixin(tmp_path):
     # init
     build = initialize(project, CONFIG_FILE)    
     build.commit_string = "MAJOR bla"
-    build.init()
+    build.init_release()
     release_version = build.release_version
 
     # test