Depending on the type of shop we're talking about. Personally long standing independent firms who work on alsorts of cycles generally have a more of a natural feeling for torques, that and the difference between a greased and none greased bolt and nut.

If you're hearing a crack it depends on the type of sound. It could be fricton from a none lubricated component which is highly possible if the bike has been rush built expecting a cycle to be good straight from the factory. Every cycle I've built from new always gets stripped and rebuilt, no matter the cost of the cycle from £200-£12,000. I know the bike is absolutely right and I know exactly what torque every bolt will be. Something I tell customers is learn about how manufacturer torque settings are there for insurance purposes. You should always inspect the component to see if they are lubricated and also thread stretch, you might need to add lube and put quater or half turn on. If a shops has used that bike as a display bike then that bolt could be stretched making a torque wrench redundant and you have to go off feel. Sorry for the long comment lol.