If you have a foam head I would use that to assist you in cutting the holes and applying the lenses and frames. Are you using a face shell? If not then I would have someone help you if you've never done it before. Put the mask on and have someone mark where you nose and eyes are located with a sharpie. Cut your holes small 1st, you can always remove more later. Then position your lenses on your mask while you are still wearing it. The small viewing holes you have cut should give you enough vision to see where you want you lenses. Have your friend take a few phone photos so you can see where the lenses positioned in relation to when your eye marks are at. Once you have the position right heat up your lenses and form them to either your face or the face shield. "DON'T PUT THE HOT LENSES DIRECTLY ON YOUR SKIN!" I know your smarter than that I'm just putting that out there. Then mark the outline of the lenses on your mask using a NON Permanent marker, I use a pencil. Then glue your lenses and frames to your mask. Just something I do, if your putting your lenses directly on your mask and not using a face shell then try cutting 4 mm eva foam the same size as your frames and applying it to the inside of the mask right behind your lenses. This makes the mask more comfortable to wear. Also use an anti-fogging agent to keep from fogging up your lenses while wearing your mask. Hope this helps.