You should prep the false nail by etching and wiping with IPA. Then prep your own nails the same way you would for any other nail service. And I always start with doing a pinky on each hand and then doing each finger left to right so they’re all being done at the same time. You need to put in a little effort and with that glue you’ll get up to 3 weeks wear
Rule #1 for press ons/full cover tips or polygel: always do your dominant hand first when your energy, patients and interest is high. Dominant hands always come out janky, so you need all the help you can get.