Real easy
How often do you service your winches? And, do you do it or have someone else do it? Is there a service where you can send the winches to be serviced?
Stripping down winches & servicing is very easy stuff.
A great suggestion on this post was a plastic container with cutout so nothing bounces over the side.
Once you have the drum off,
Take the parts down below, and service in an area where parts can't accidentally get into the drink.
Take photos as you disassemble.
Get lots of varsol and a bucket. Use a small stiff brush, and go over all the parts, etc with the varsol & brush.
The only tricky parts are the pawl springs & pawls.
After once or twice, its easy.
Don't overdo it on the grease. On the lewmar videos, it shows how much to apply.
Good luck