There is a huge amount of data that you will be expected to double check and ok during the conversion. This is in addition to attending webinars on other issues at the same time. I was doing a lot of it myself, and it was very stressful. We did not convert AR or inventory. We did not move our AR over, but we had to add a lot of inventory.
What I did not like was that we had four different trainers during our training period. You are assigned one who is supposed to be with you through the entire conversion. One was pulled for another project, another mysteriously disappeared, the third one left because she was already scheduled elsewhere, and the fourth one, while very knowledgeable about some things, was clueless on AR issues, which we had begun to experience at that point. We had the bad luck to go live on Dec 1st, just one month before many insurances switched to 5010. That was another huge headache. Plus, when your training is over, those people are basically dead to you. They have lots on training built into the system, but it is not searchable, so it makes it difficult to find your own answers, forcing you to call support. I usually e-mail them my issue, at which point they call me later and ask me to explain it as they "haven't had a chance to read the e-mail yet". Huh? I wish there were more materials available to tell me to click this box, or unclick that one, but not so. I guess they are trying to keep their support people employed.
This may turn out to be the wonderful thing that we were sold, but I don't see it happening anywhere in the near future. Unless you have a dedicated, interested staff willing to give a lot of help, I would suggest you look elsewhere.