Dang, if you're even WONDERING if your shop is going to have problems understanding THOSE instructions... you'd better find another shop.
I've seen many horrific keyless entry installations done on 124's, 126's, and 201's. One involved installing a door lock motor at the driver's door to physically push up the lock knob. The installer probably realized that this set off the alarm if the door was locked with the key and opened with the remote, so they conveniently unplugged the alarm module.
My best advice to you is to wire the thing yourself. Lots of shops half a$$ their work and you never notice until some fuse mysteriously keeps blowing or you smell smoke from somewhere.
Crimp well, use wire (zip) ties, and remember that heatshrink tubing is better than electrical tape 99.999% of the time.