This is why I created the plug and play kits.
Some are very comfortable cutting wires on the factory harness and cutting/drilling holes in the dash, but many more are not. I'm not against the DIY approach and I've actually helped owners with DIY solutions. The thing is that only a small percentage of owners are comfortable taking the DIY approach and some of those who are more than capable of doing it don't want to (that is the bracket I fall in to).
With my kit it is simply a case of taking the kit:
and then 15 minutes later with only a Philips screwdriver you are done! With no cutting or drilling and it is completely reversible, because you can remove it just as easily as you installed it. The main cost is in the plug and play harness so I maximize that sunk cost by adding the parking brake bypass and the rear camera override. The remote solution was to avoid having to mount a switch and I use an RF remote which can be paired with the homelink buttons on the rear view mirror for those who would rather not carry or used the keyfob remote.
Something else to consider is if you pay a shop to effectively take the DIY approach, it would probably cost you more in labor and it wouldn't be reversible and of course wouldn't have the other extra features.