My 4.A's were my first set of customs. The first few days there was pain in one ear and they did feel a bit weird in my head. However, after about a week the pain had gone and I stopped noticing them. From what I have since learned, it takes your ears a little while to get used to having something like a CIEM in them for any real length of time, especially if you're not doing a particularly good job of inserting them (which I wasn't).
If you're feeling any discomfort give it a few says, as you said. Play around with how you insert them, shift them a bit in your ears. If you're feeling anything beyond mild discomfort you might want to bug Heir or talk to your audiologist. But it's definitely worth waiting a bit, as long as you're not in any serious pain.
Yeah, I've got some mild discomfort, but I think that's more my fault than the customs. I cleaned out my ears yesterday and today (spraying warm water in them as was recommended by the doctor, not anything potentially bad like q-tips) in preparation of these arriving and after doing so today my ears were a bit sore. Fortunately, even with my ears being a bit sore I had no problem wearing them for a couple hours, so overall I'm quite pleased so far.
I'm actually surprised how easy it seems to insert mine. It takes me a couple tries to get them in the right starting position, but after that they smoothly twist right in. I was actually expecting there to be more difficulty/resistance, but I guess a decent seal doesn't require them to feel really tight and hard to insert.
Edited by Defiant00 - 2/4/13 at 5:55pm