If you are using a command line tool for 10 years and don't consider yourself an expert then either you are not using the tool very often or the tool is not well designed. In case of git I would say it is the latter. I mostly use git via tortoise interface and that works well 95% of the time. Other 5% is split between git mv, git branch -D, and trying various commands in order to make git do something simple that can't be done and then giving up. At this stage I see git as necessary evil rather than something that helps me with source version control.