I have just recently moved into a C4-C4 wormhole.
It's something I've been planning for probably a few months. There were a few preliminary things I needed, firstly I needed to get into a Vargur so I could run sites. Secondly I needed to get my alt into an Orca so I could roll holes if I needed, and thirdly I needed to finish my POS reactions I was doing down in null. Of course, all this hinged on me finding a good hole to move into.
Since the first thing I needed to do was find a suitable hole, I took two of my characters that weren't doing anything and put them in C4-C4s or C5-C4s, so I could scan down the static C4 every day and look for abandoned ones. I was wanting a no effect hole, as they're usually less desired and easier to find. It was either that or a black hole, but eventually I realized that I didn't want to deal with that hassle, so a C4 no effect was what I was looking for.
It took me a solid two months to find a suitable candidate: a normal C4, the only catch being the system was too large to d-scan across easily. But I can deal with that, so I put the alt that found it in there to wait until everything else was in order.
Following that, it took me a few weeks to move stuff up from nullsec and conclude my business down there. About four or five days ago I moved into the hole, bringing most of the POS equipment in with the Orca. Now it's time to get used to wormhole life, and all the scanning and uncertainty that comes with it.