It was pretty easy to transition over to Aweber. Basically you need to let Aweber know that you are switching from MailChimp, export your contacts to a CSV file and then cut and paste the contacts in. The only pain was recreating all of my forms and autoresponders…especially the popup. I would recommend just signing up for Aweber from the start and not having to deal with it later.
Before you can send AWesome emails with AWeber, you'll need someone to send it to. The easiest way to begin building your list is to import contacts that have opted-in to your email list, or gave you permission to send them emails. These could be subscribers you've emailed from another provider, or a list of contacts that you've built through your business.