Bredding nets can be very stressful for the fish, so if you are going to use one, I would suggest that you leave the female in there for a minimum amount of time.
I hope you don't mind if I just add a note of caution.
Guppies, along with all poecillid livebearers (ie mollies, platies, swordtails, and various others) are able to store sperm for up to 6 months, and use it to continue producing 30+ fry every 4-6 weeks, for that 6 month period. Plus of course, if there is a male in the tank with her, then the sperm will be continually refreshed. In other words, she becomes a baby machine.
A lot of people say that they couldn't bear to see the babies eaten, this is only natural, it's our human instinct to care for our own offspring, and we project that onto the fish in our care. The guppies themselves have no such instinct, on many occasions they will simply give birth, turn round, and eat the fry that's just been born. This is why they have evolved to produce so many fry - only the strongest will survive.
If you want to keep the fry, that's fine, but you will find that very soon you are overrun with them. You need to find somewhere to move them on to. And this can prove difficult, because they are so easy to obtain, and therefore cheap, many LFSs won't take home-bred livebearers. Some people find success on Craigslist (in the US) and Gumtree (in the UK and Australia, and presumably elsewhere in the world too), but remember that having home-bred fry won't be a one-off thing, you will continually have this issue to solve.
What I'm trying to say is, sometimes it's just better to let nature take its course. Like I said, this is only a word of caution for you, it's your choice!
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