I purchased one a couple of years ago. It was alot of trouble with the glue and all. I have a low hairline so the glue got in my hair so this is one of the reasons women shave their hairline and of course to have a smooth look.. I wanted one for hair growth purposes, so I was not about to do that...
There are so many different types of glues, lfs, etc., I was a member of Black hair media for a while to figure out how to use it, so I would suggest you go there. But, it wasn't worth it for me because depending on the adhesive you purchase, you need an alcohol based one to remove it. Lace fronts can be expensive not only the cost of the wig, but if you get it applied professionally you have the cost, or if you apply it your self you have to pay for your supplies e.g., scalp protector, adhesive, adhesive remover, goo be gone (for glue that sticks to the lace or your hands), knot sealer for the wig, fray block if the lace start to shred etc., Anyway, that's all I can remember but it was a couple of years ago
I now wear half-wigs and I can take care of my hair underneath with oils/growth aids and it has thrived better this way without shaving my hairline!!