slippinjimmy
Otherwise, it will be slow going with laptop mining performance levels. Consider Hive OS or something similar. As to which cryptos, look into something with a high ratio of "potential future gains" versus mining difficulty.
As to the troublemakers and jerks:
1) To the extent you can, accommdate.
2) Limit contact to the people who can work with them with the least friction.
3) A quality product is the result of process, not something conjured up instantly and perfectly. Work and refine the pricess and make sure the customer understands it.
4) Keep a policy to neither abuse nor take abuse. Reasonable, constructive criticism is one thing; attacking just to enjoy inflicting pain is unacceptable. If they want to piss on something, direct them to the nearest outdoor fire hydrant.
5) If your product and development process is sound, stand your ground. Assert that "business is the persuit of the possible." If the customer wants magic, buy'em tickets to Las Vegas and GTFO business.
6) Increase your customer base so that you are proportionately less exposed to problenatic customers.
7) Train your staff in "people skills" for de-escalating conflict and staying focused on getting the work done.