So easy for me, coz I own an eyewear shop. I can teach you a simple way, but I can not assure you to do it right. Coz you know, I have been doing this for years. First of all, you should realize the value of your glasses, if they are expensive, then I would rather you send them to an eyewear shop. However, if they are not, you can prepare your stuff now. Remember not to hold your lenses directly by your hands coz your nail may scratch your lenses. You can use a microfiber cloth to hold them. It is much safer and cleaner. If you are smart, I think the next step will be easier for you. You can use a screwdriver to loosen your glasses. This is the most difficult part as well as the key part. If you finish doing all of these, then congratulations to you, you have made it.