It's going to mess with your mind and your soul... ;)
Reached Legend tier a couple weeks ago, and by far the most difficult thing to adjust to IMO is the greens. Sure the tees are further back, but that's not the killer -- at least for me. If you've got a driver that'll go 300 with a little backspin don't worry about the tees being further back.
Work on your short game and putting. Every missed ding -- every mis-calculation will send your ball further away for par. I'm lipping out and missing more birdie putts than ever before, and the putts for par aren't gimmes. It'll just take time to figure it all out -- i hope!! ;)
Was low 60's even sub 60 as a TM, now I"m a couple under and struggling to break par on the more difficult courses.
The putts just aren't going in, and some of the breaks are ridiculous. If you don't make it, you'l be double the distance coming back for par.