There are many git tutorials. Git Immersion http://gitimmersion.com/ is the one I used. Not claiming it's the best. Just that it has a long track record, has been updated since Jim Weirich died, and worked for me. Eight hours spread over several days will probably be more than enough and you will learn much more Git than you need.
The reason I recommend learning the Git command line is that it decouples version control from editor choice. If you try a different editor a month from now, only your editor changes. You don't have to learn how it handles Git...that's the Unix philosophy: compose little programs that do one thing well. All that changes is the editor part of your workflow.
The other reason I recommend "just learning the command line" is the many times I have spent many many hours looking for the perfect tool, wading through redundant Google search results, downloading and installing software, learning new special programs, only to find that underlying issue remained. I didn't understand the program I was trying to avoid learning.
I think you could use just about any latex editor you want and have this workflow work for you.