When I went from a TT to a FW I found myself overcompensating and zig-zagging all over the place. I realized there was a lag from my action (turning the wheel) and the reaction (FW changing direction, reacting to my input). Now, with practice and anticipating the reaction lag I can back this thing wherever I need it.
Go slow with small input changes.
I prefer not having a spotter. I'll tell my DW if she is with me to stop me if it looks like I'm going to hit something but don't direct me.