Tipping at spas

I've decided to spend part of my tax refund on a half-day spa package. I was told to have cash for tips. I'm having 5 things done in this package and am confused on how to tip each individual person.

1. Do I tip based on the percentage of each individual service, or based on the percentage of the whole package and divide by 5 (I'm saving about $65 by purchasing a package rather than 5 individual things)?

2. Should I leave a 15% tip based on the price, or up it to 20%?

I never know how much to tip so I generally overtip.

Thanks!

15-20% per service. Tip each therapist individually, the receptionist will usually give you envelopes for the therapists who did your services. If you're not sure how much each service was, have her break it down for you. Hope this helps.