going to do mine one of these days...
i did it to my pulsar ones, to paint the lens surround black, but they had glass lenses, id assume the same method however.
oven on about 80-90 degrees, pop em in on a tray with baking paper on there, after 2-3 mins pull em out, see if theyre hot (ALMOST too hot to hang on to) if not giv em another minute and keep checking, then you want to GENTLY pry the lense off. just do it a little at a time, if its starting the get difficult, pop them back in the oven.
its best to take your time with this, you dont wanna crack your lense from pulling too hard!
mini disclaimer: i take no responsibility for any damage that occurs from doing this, im not an expert