The shops I know, while good with their product, tend to push their new product more than help with others', especially used. Your mileage may vary.
Some of this may be outdated, but hopefully others will chime in. I am an old time fingers shooter and haven't kept up with new tech and may not be much help. We had plunger buttons on the rests and aluminum arrows and cams were just starting to come out.
This is based on mild cam or no cam bows, but there is not much to setting up a bow really. Make sure limb adjustments are made in similar amounts, check your nock point, your lateral rest adjustment and be sure arrows are spined for the draw weight.
If you have an arrow with no fletching, set up a big sheet of paper 6' in front of you (3' from tip at full draw). You want as close to a perfect circle as possible. Any tearing will show what adjustments need to be made. Tear above/below shaft hole is nock point adjustment. Tear to side is lateral adjustment. This is assuming properly weighted arrows and good follow-through on the shot. The paper has to be close enough to be impacted before the arrow wobble can really get started, although technically it starts as soon as it clears the rest.
And what Kabonka added also. Check cables and string absolutely. If the string is kevlar or one of the superfilaments it should be fine. If it is just the old, traditional multistrand I would replace it. They tend to get weakened under the loop wraps where they hook onto the cable.
I feel like an idiot because I used to be a certified instructor and I can't even remember the terminology.
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