Andy, it`s entirely up to you, but for me, I`d prefer not to be having to cut the system ` down` to size...... measuring is ok, but heads come in various curvatures etc., and I just think with a Fullcap, a template is the way to go, for a snug fit. You`ll have enough to be dealing-with, without cutting into the lace........
As to just ` biting the bullet` and sticking it on and going ` out` with it---well, just depends on your own ability to deal with the inevitable ` questions` from people who know you....... some people would be really apprehensive and self-conscious, others have a relatively carefree attitude...just depend on yourself I guess !
Have you checked out JRob`s site [hairjive.com] for tips on all aspects of Fullcap wearing?