I kind of do something similar but in reverse. After I put the tapes on the base.. I leave the front alone.. I than star to peel the backing off a little bit. but than put them back down.. this way they are easier to remove later. I only take the backing off at the very back center.. I line up the piece where i want and tack down the back.. Now you can flip the piece up forward standing in front of the mirror and have a clear view.. Than i remove two more tape backings on each side, tack it down,, flip it back up.. remove the next set of tapes.. etc.. going towards the front.. Than when the base is completely attached.. if u are using tape for the front u can now remove the backing from the front and tack it down. or u can glue in ur front hairline.

another method i use i squirt a little alcohol on my scalp and the tape and just position the unit with all the tape backings off from the start.