With a nine month old you don't have to wean in order to be able to work out, have a drink or get your nails done. I started nursing 4 years ago and I've been doing all three (with the exception of during pregnancy) ever since.
To be perfectly honest, he stops drinking when the formula comes out because formula is NASTY. You try it. Yuck, yuck, yuck - especially when he's spent the past nine months enjoying something that is apparently a little more palatable than cow's milk.
My advice as far as that goes is to breastfeed 3 more months, don't get sloshed - as long as you are not DRUNK there is not enough alcohol in your milk to affect a healthy nine month old. If you do get drunk, pump and dump until you're sober. Getting your nails done (assuming you don't stay at the salon long enough to get high off the fumes) likewise isn't going to put harmful levels of anything in your milk - and even hard exercise isn't going to put anything other than maybe an off flavor in your milk. Your son should be eating some solid foods, so if your production goes down he will likely make up for it in food - and may wean himself.
So far as sleep time - hmmm.. good luck. I use a bath, a baby massage, and a sippy cup (neither of my sons will do bottles) of water, and a lullaby cd.
They screamed themselves to sleep for awhile - my 4 year old screamed for about 2 months, my 16 month old only screamed for about a week - and then they got used to it and just went to sleep.