Go ahead and try to polish the scratches out by hand for a bit and then judge how long you'll be playing Karate Kid.
If you decide to use a buffer or polisher, it's not a difficult skill to learn and way less effort and gelcoat, even thin gel on camper bodies.
Only a few basic rules.
Keep everything clean. 1 grit of sand will make more work than you originally had.
Keep the buffer moving. Sitting in one spot and trying to grind out a blemish can/may burn or burn through the gel.
Don't use it on decals.
And polishing compound is very forgiving. It's abrasive qualities "polish" , not sand.
A small amount of common sense can replace a lot of elbow grease.