There are three big adjustments.
1. Defenively no more leaving Curry open.
2. Offensively, get Tatum early easy shots and get him going.
3. Grab more defensive rebounds.
Do not change the lineup.
Green is the problem for the Warriors. (if healthy) Williams should start and he can just cheat of Green and be the free safety for rim protection and rebounds, while Horford needs to box-out Looney to stop offensive rebounds.
Do they put Green in the pick-and-roll (pick-and-pop, just let Green take the shot), then blitz Curry. Williams is a great perimeter defender with his ability to close-out on shooters, but obviously Curry and Thompson are something special. Don't give them an inch to shoot. If Curry does manage to pass to Green, then Green is an excellent decision maker to finish that play, but stay on the (corner) shooters and perhaps Horford can prevend Looney getting an lay-up in that situation by using his experience.
White/Pritchard is a great compatable back-up back court.
Limit Curry and the Celtics are winning this series.
If I were Kerr. I'd bench Green. That would be a huge adjustment.
Still, start Curry/Thompson/Wiggins/Porter/Looney (with Poole, Moody, Green, Bjelica rotation minutes).
Curry (40) / Poole (8 )
Thompson (36) / Poole (12)
Wiggins (36) / Moody (12)
Porter (28) / Green (20)
Looney (28) / Bjelica (12) / Green (8 )