Do you have the bedroom A/C prep. If you do it should be pretty simple. other than cutting a huge hole in the roof
. if you do not have the A/C prep then it might be a job for a service center.
the other thing you have to consider is what size to use in the bedroom. We have the factory installed 13,500 BTU, so will say that it is too big for just the bedroom, but with the this Texas heat it is working great and will shut down for long enough to easily fall asleep and it dose not bother us when it does cycle on.