You could directly spike the rails for a hand made turnout to wood ties glued to the road bed. This is the 'build in place' method. This can be a problem if the turnout location is hard to reach.
If you use some PCB ties the rails are soldered to the PCB ties to make a turn out on your work bench. It is easier to build turn outs at your bench than directly on the layout. Also, the PCB ties hold the rails 'in gauge' for trouble free operation. A completed turn out is then very much like a commercially purchased turnout.
Only enough PCB ties are used to hold all the turn out rails in place. They are not used at every tie location on the turn out. On the Fast Tracks template the PCB are indicated by the shaded ties. Did you check out the Fast Track videos?
Shearing the FR4 PCB material is ok as long as you know it'll twist and untwist the tie strips before cutting to length (just hold each end with pliers are twist the strip to straighten). Alternately, sawing the FR4 into strips would also work well. Just use a fine toothed blade and be careful that the cut strip doesn't caught in the saw table's blade slot.
One other thing to think about is powering the turnout. The Fast Track method is to have a totally isolated Frog that is then 'power routed'. However there are other ways to power the turnout. I use the isolated frog which is then powered through a DCC Frog Juicer from Tam Valley. Another method to power the frog is from the contacts of a switch machine like the Tortoise.