Complex or basic the work flow is the same. Once you know the workflow you can make changes to your model in Blender and reimport the asset. I just made a tutorial this morning targeted for beginners which cover the workflow from Blender to Unreal including model texture painting, mesh unwrapping and baking to give matching assets in Unreal as you would get in Blender.
Only glitch my pdf files cant upload to the Unreal forum.