what kind of coatings do you want to remove ?
factory paint or repaint from previous owners ?
a good citrus based paint remover is eco friendly plus easy on the hands.
the "aircraft grade" remover will take care of epoxy, enamel and latex paints
but is a bit harsh and requires more care in handling, application, removal and disposal.
IF the existing paint is sound, not flaking and stuck good - just abrade it and
spot fix anything that looks suspect........
do not use self etching primer over a painted surface. it is designed for bare metal only.
a good exterior grade oil base primer will work just fine for your boat.
avoid the "primer and paint in one can" household paints.
many good mechanical gadgets on the market to remove paint by hand.
most of those require a 4" angle grinder, safety gear and a lot of elbow grease,
learn how to use the "search" function on this forum..... MANY excellent tutorials
that members have posted similar to your project.
https://youtu.be/ZJVyacEQLPM
and yes, it can be a bit daunting to read all the labels on today's paints, primers and removers.
the EPA has placed such restrictions on the VOCs that it makes the hobbiest go bonkers.
again -
Read, Understand and Follow the instructions on all products you may use.
pay particular to the safety instructions: eye and respiratory protection.