Wash your ass!
Brush your teeth!
Floss!
Maybe groom a bit here and there.
Be kind, be humble and honest. With the ladies and yourself.
If you don't "click" with a lady you visit then just move on.
Stay within her rules and sex her up like you won't ever have the chance to again.
ABOVE ALL
HAVE FUN!!
If you're not having fun then this isn't for you. Remember what this is too! Don't fall in love, but it is ok to make love now and then with a lady you "click" with. Just don't get attached!! It never ends they way you want it to.
That's all I can think of right now.
FWIW, I am 6 ft 380 and I have never had a lady complain about my size, to my face anyway. I just go in and fuck like I'm a porn stud, at least in my mind
, and have a good time.