I assume you meant 1.9.1 and not 1.8.1. Just disable anything that integrations with CB. So if you've Kunena installed then turn off its CB integration. If you've K2 installed then turn off its CB integration. Rinse repeat. Once that's all done disable all non-core plugins within CB > Plugin Management. Your migration should go smooth as possible. You need at minimum Joomla 2.5. For system requirements see the below page.
Warning! This is a migration. It is not an upgrade. Do a full backup of your site. Do not do a first time migration on a live site. Test on a clone of your site first so you know what to expect.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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