I just bought a Shure PGX Wireless kits with a lavalier mic. Just how delicate are these things? They are so small, yet I'm impressed by the quality of the sound you can get out of such a small condensor mic.
So I guess I would treat it the same way I would any other microphone? Maybe I'm asking a silly question but because of the size this mic seems so fragile.
This is very true. It's easy to tug the cable hard enough to break it. I've replaced the cables on our lav mics dozens of times. Not a fun job at all. The mics themselves all still work fine though. Keep them dry and there's not much that can damage them with normal use.
One thing you might run into. If you hit the heads hard against a hard surface they will sometimes lose sensitivity. Something in the element gets damaged that drops the output as much as 6 to 10 db and get "tinny" sounding. I've seen it a number of times on the Sony ECM 55 and 65 series.
Of course, it's usually happened after someone swings the mic around in a circle and bangs it hard on a desktop, "just for fun".
I've found absolutely no way to repair them. At least with that series of mics you can actually open up the head and the body of the preamp/power supply and replace the cable. In some, you cannot replace the cable, as the head is one single molded piece, and you have to replace the head and cable as one piece.
In normal use you won't have any problems. The instances I'm talking about are for mics in constant use throughout the day with multiple newscasts and multiple talent using the same mics. They get a lot of normal wear and tear and some inappropriate handling "just for fun".