1- Get a razor with as many blades as possible, some small scissors/trimmer, a mirror, antibump shaving gel(preferably a clear one so you can see what you are doing) , a method of exfoliation and hydrocortizone cream.
2- Trim as close as possible with the scissors/trimmer.
3- Soak in warm/hot water before hand... this seems to soften the hair and makes its easier to cut. (I usually drain the tub right after so that my shaving gel doesn't get washed away while I'm actually working)
4- Use lots of the shaving gel on your pussy and inner thighs.
5- When you are ready to shave do so very slowly. Taking your time reduces the chance of nicks and gives you a chance to turn it into a very enjoyable event.
6- Use the hand mirror so you can see what you are doing. This allows you to see spots you might be missing, but it can also add to the overall experience. (I have a free standing one so that I can prop it up between my legs and have both hands free to work and so that I can also feel for any areas that might feel like they need extra attention)
7- When you are finished pat yourself dry, don't rub. Sometimes rubbing will irritate your skin especially immediately after. After you are dry go ahead and apply the hydrocortizone. (Perk of hydrocortizone? Once you've got it you can use it just about anywhere. If you get razor burn on your legs or even just the random little red spots you can dab it with cortizone just there and it helps. The stuff works for regular rashes, and everything in between so it's just a handy supply to have around the house in any event)
8- Over the next day or so you can start an exfoliating process, and you can keep using the cortizone. (or moisturizing lotion if that is what tickles your fancy)


And by 'you' I really meant me cuz this is the system that I have found works best for me. I think some of the advice is repetitive becuz some of the other posters give the same advice but... I really suggest trying the hydrocortizone.