Yes, baste it. Use your method of choice. I like spray basting the best, but others will have other thoughts on that. Do what works for you.
I usually start in the center and work out. This is best for me because I'm not an excellent baster. It let's me chase all the wrinkles out to the edge.
A walking foot help immensely, but it can be done without one.
I also suggest starching the backing very well. That seems to help me with puckers.