Hi I am from Vegas and have grown up there so here are some ideas for hair:
Diva Salon is awesome, they have two locations.
Belagio Salon is great is you want to be near the strip.
Green Valey Ranch is awesome as well. Really great spa. They do make up, hair and spa stuff.
Make Up - A girl I know does really great make up and works on some Vegas shows, she does lots of weddings or may know of someone if she is not available. Let mw know if you would like her number.
If you go to the strip, stay with the nicer hotels, Wynn, Bellagio, The Hotel, Venetian, Mandalay.
Good luck