Hi Fortyfor,
Edging can be quite tricky to master, both as solo and with a partner.
Gradually bring yourself up to the point high in the plateau phase where the orgasm is actually building, and then reduce the level of stimulation to just below that needed to trigger the orgasm. (took that from wikipedia)
You should not stop for hours.. when you get really close you should slow down to avoid the orgasm.. when you cannot touch anymore without passing the point of no return, you will let it cool down for a minute.. Then you start again to you hit that same point where you feel you cannot do one more stroke without shooting your load.. Repeat a few times (could be maybe 5 times), or continue until you go crazy
It is VERY important that you relax your legs completely.. You could spread them apart. That makes it easier to relax..Empty your mind and breath slowly and make sure do everything slowly.. Use lots of lube (oil ect.) Here is a technique you can do on yourself:
http://www.handjobadvice.com/endless-tunnel-hand-job.html
That will make your orgasm alot more powerful than normal..but it takes willpower to stop when you get to close to that phase. Having a partner edging you is alot more fun
But ofcause she will need to learn how much you can take..she might need a few tries, but I bet you wouldnt complain about that
It will give you more control if you do it on a regular basis..you will get to know your body better, and you will get to know when its "safe" to continue, and when you should slow down or cool down completely
You can read more about it here:
Orgasm control - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Tantric_sex
If you got any questions, feel free to ask!
Good luck mate