Over the years I've helped dozens of club members clean their telescope mirrors for the first time.
Many people are downright scared during their first attempt.
But there is no reason to be scared if you follow this safe and easy procedure. If your mirrors are just dusty, at most, rinse them only. Every time you clean your mirrors, even if you use the safest methods, you will make some microscopic scratches on your mirrors which scatter light. These tiny scratches degrade your telescope's performance much more than a little dust. Since you can't scratch mirrors if you don't physically touch them, I rinse my mirrors about two out of every three times I do cleaning.