The beauty of lace is it allows your scalp to breath and sweat to evaporate off...also allows heat out ..... lace won`t lift.... you could run a strip of tape front-to-back if you wish / are concerned ....when bonding the perimeter, you`d always ` pull` the lace slightly to put ` tension` on it, therefore the center area will not be ` loose` ....... I`d strongly advise you to get supplies.... I don`t know which supplies she`s offering ...possibly shampoo / conditioners .....you`ll always need to be in a position to do your own touch-up`s ..... if she`s selling adhesives /melters etc. that`s fine but she possibly has a limited range..... you need to be able to deal with issues as they can /do arise, at home. Good luck with the cut-in.!