I've done it before and it can be difficult to get into a flow state that is more natural for me by myself but like all things requires practice to acquire and

I've done it before and it can be difficult to get into a flow state that is more natural for me by myself but like all things requires practice to acquire and maintain skills and also, familiarity as you say, with the tools and problem space or it's not a very good assessment of your ability except for that one very particular set of circumstances of going in blind on tools/editor!