We are planning a hooknose clave soon at Sekiu. I suggest you join us, then you will be on a boat with an experienced angler and will learn the ropes without risk. Most likely sometime in September.
Most of the boats are 16ft Sealakers, very seaworthy and 15 hp yamahas and mercs. No nav gear, byo. Handheld GPS is a very good thing to have out there, but a compass has gotten me out of many tricky situations.
$60-70 per day and very comfortable w/ two anglers, you can squeeze 3 if one takes turns. I prefer two per boat.