I have a house built in 1926. The center beam is wood. The center support post is rusted at the bottom. The house used to have problems with flooding.

In the past couple of years, I've noticed a lot of cracks in the plaster. Most of the cracks are in the center of the house.

I believe the cracks in the plaster are due to the house settling because the beam is not getting the proper support because of the rusted pole.

If my assumption is correct, can this be fixed by an average homeowner such as me or do i need a professional?

If I need a professional, what type of a contractor would i get?

If i do it myself, what do i do, how do i do it and what do i look out for, etc...

I believe i've seen it done on one of the home repair shows on tv. Buy one or two of the screw posts from Home Depot/Lowe's. Raise the posts until the beam is level...correct?

Thanks!
Steve