Just slow down.
I don't like distracting myself from the moment. Squeezing or pressing doesn't work for me but I've heard that advice as well.
I like to focus on what's going on, take it all in. My advice is pay attention to what you're feeling and back off the edge quickly if it feels like you're even getting close to it. Pull out and rub or slap her clit with your cock. Go back down on her for a quick break. Anything to ease that initial intensity even a quick position change. Do it in a sexy way to keep bringing her along. If she has any experience at all she'll know what you're doing, most likely she'll take it as a compliment that she's so hot(maybe you can even tell her that which will pay dividends) and she'll appreciate the effort. It only takes me a minute or two to get over that "oh shit this feels too good" feeling and I'm able to last as long as I want.
You mentioned condoms. Extra strong condoms can help because they are thicker but stay away from the ones with the delay stuff in them. You'll put that on thinking it's works right away and go balls deep and finish before you get started. Best case is you'll get off the ledge by your own doing and then won't be able to cum. If you aren't using condoms ask her to taste herself on your cock.(I find many, not all, women like to have a taste but most don't like to suck a cock with a condom on) The time it takes to move to that position and back may be all the time you need to get off the ledge.
If she's assertive I like to let her get on top because I rarely cum that way. Another position is jockey(man on top straddled the woman's closed legs). You may imagine this would be too intense but it is more like coital alignment, it limits the ability for long deep thrusts and is more of a grinding position that will stimulate the clit nicely but doesn't overstimulate me.
Whatever it is you are doing pay attention to what your body is telling you and back off quickly. It usually only takes a couple of minutes and you can be fucking as long as you want.
Also...Practice, practice, practice. The more in tune you are with that feeling the quicker you can learn to deal with it and get past it.