Re: Bottoms up?
It does not sound like the initial paint was sanded properly or was just incompatable w/ the present paint.
It does not need to go to gelcoat, unless you want to barrier coat the hull. If you decide to sand to gelcoat - you should absolutely barrier coat while you're there.
If you do not want to barrier coat, then just sand ( or have someone sand ) the top layer of paint off and into the bottom layer w/ 80 grit paper leaving a nice surface for the new paint to 'bite' into - a D/A sander would do a great job.
Then spray the hull w/ water - maybe even soap, rinse well and let dry - getting all residue/dust off. Then, via a paint roller, paint w/ a quality, high-cuprous oxide level, ablative paint. I like Petit SLR...
As for the cost to have someone do this. I don't know, but it is sh_tty work and if you have the $, than it is worth having someone do it.
Good luck.
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