Two ` risks` of doing what you suggest---firstly, there is a strong possibility that a barber/stylist will snag the lace with the teeth of a comb, should they not be aware you are wearing, and could easily tear the lace, and secondly, it will be quite obvious to him/her because the hair would be longer than your existing hair and also, working at such close-quarters, and dampening the hair, they will ` tumble` to the fact that you have something glued/tape-on, and then how will you feel when you`re sitting there and you get ` busted` ?
It`s better to just bite the bullet on this, and be up-front... there`s no shame in wearing or wanting to improve your appearance....... if you are ` that` self-conscious, you could simply send it to Debbie at http://www.splitendshairreplacement.com and she can do a ` remote` cut -in for you...if it`s only a partial ,you could easily ` adjust` it a bit once she has it trimmed for you, and you have it bonded onto your head.