I am thinking of getting a new 1911
Does that imply that you already have one? Or, "New" as in my first 1911?
Lessons are always good, provided the instructor is worth his salt. There are many different methods of instruction, some work for some folks, some don't.
Be sure and do some research in your area for what you specifically want. Basic, Intermediate, Advanced, SD, Drills, IDPA, etc,...
I'm sure more valid info is forthcoming.