Im moving hosts. My domains are registered with Godaddy, if i change the name servers, does that mean my domains will be in limbo/inaccessible during the 48 hr changeover period?
Not at all. What it means is that some dns servers will update sooner than others and best to have your old hosting up for a couple days to a week along with the new hosting. It really is simple (unless it is a database.) 1 site I resently switched on godaddy was actually accessible in less than 1 hour from where I was.
normally .. the 48 hours are the maximum possible downtime you will have ... but you will not have that much downtime i think .. it depends .. sometimes i have about 1 hour downtime when transfer .. but i think that your can always contact you old host to update your DNS to make the downtime smaller