"Views on this appear to differ." - Stand back and watch the worms escape from the can!

I sit in the "good welly" camp. Although I do possess a torque wrench, it's only used for things like head bolts where an even torque is required.

I will add that "good welly" doesn't mean over tighten so much that it's impossible to remove next time.

Staightforward job. 13mm socket to remove the caliper screws. Replacing them, well, you'll be lucky if you can get a torque-wrench in there. I regret to say that I have to use a short bar and 'good welly'. The retaining spring is a pain to replace. I use an adjustable pipe-wrench to pull it into place. It's worth taking out the slide-pins and cleaning them. The ends are covered with a rubber cover, so take the cover off then insert a hexagon wrench (Allen key) to unscrew the pins. I seem to remember that it's a 7mm hex key that you need, and there's not many sets which have a 7mm size in there.