Imagine a new shooter, first gun, asks for help at the store where he bought it and gets told to look it up on YouTube. Are you sure that's what you want?
In a polite, informative way, yes.
Because it's a slippery slope. "Hey, last week you guys adjusted my trigger, but there's too much creep. Can you reduce the creep?" "Hey, last week you fixed the creep, but now there's too much overtravel, can you fix that?" "Last week you fixed the overtravel, but it feels too heavy, can you lighten it?" "Hey, I think you lightened it too much, because I leaned it on a shooting bench, then it fell and went off".
Either he should own a set of allen wrenches, or he should not. If he should, then adjusting the trigger on a CZ 457 after watching this is dirt simple.
https://www.youtube.com/watch?v=TiUVoqf5AiY
If he cannot fathom adjusting a trigger after watching that, then he should just shoot factory settings and be happy.
Virtually all of the things we own can be user-tweaked and adjusted for better performance--but the know-how and the liability needs to stay with the consumer or a professional "tweaker" (in this case, a gunsmith).