I've been getting Restylane injected into my lips,...
I've been getting Restylane injected into my lips, and some of the wrinkles around them, for a little more than a year and a half. I love the effect, and have had no side effects other than some bruising and swelling (when I was taking a lot of Advil). The injections do hurt quite a lot, but I feel that it's worth it to correct that caved-in look that happened when I went into menopause. I looked tired and pissed off all the time (so what if I really was tired and pissed off...). A little Botox between my eybrows and some filler in and around my lips, and I look a lot less like a potential murderer. It's all good.
The mistake I see a lot of people making with fillers is that they go in and have everything done at once. I'd suggest that newbies start by getting a small area done with a small amount of filler (my Med Spa does not require that you use the entire syringe, and they will hold the material for you for your next visit). If it's the lips, then underfill, and see how you like it, and see how your body reacts. You can always come back and get more.
The other thing I would stress is that the effect depends entirely on the skill of the injector. I have mine done by an RN, who has good visual sense as well as medical skill. Look carefully at the faces of the clients who use the provider you will be using. If the waiting room looks like a duck pond, run away.