You can buy a testing kit at a home center to see if you have lead paint. If you do not have lead paint then you don't need to be concerned with it.

To avoid damage to the underlying wood the best way to remove paint is with a liquid stripper. There are various kinds. You do need to follow directions to avoid inhaling fumes and getting the stripper on your skin. However, there is no dust or smoke with lead in it.

If the paint is sound you may simply want to wash it well and repaint.

There is no easy way to do this. This paint almost certainly contains lead and should be removed by a professional who will use the proper equipment to both protect the people stripping the paint and protect the surrounding environment from contamination.

have it tested for lead and hire a pro