A quick trick to last longer - use a ring around your balls to keep them from lifting up in the body - this makes ejaculation more difficult. Also, as someone mentioned get a flashlight and practice ejaculation control with it before hiring a SP
Practice Tantra, there are lots of resources available mostly the books of Mantak Chia.
Few rules that you can start doing right away
1. Stop watching porn
2. Masturbate often and a lot but don’t ejaculate
3. Meditate
4. Go slow with the penetration