Depending on how much the house is out of level will determin your course of action. You can level it the way you leveled M.H.'s with a water level, or using a spirit level or line level. Water leveling is the most accurate. If you have a lot of leveling to do consider this, 1. Where are the water, gas, electric lines, am I going to have enough room to lift the house without pulling these lines loose, or damaging the fixtures above?
2. Disconnect the house from the pers if they are bolted down.
3. Only lift a portine of the house at a time.
4. place any new pers below the frost line or at least 8" in the ground if you donot have alot of freezing in your area, I would rent the jacks, its cheeper for a one time deal. Jack size 12-20 ton times 4-6.
5. Rember "SAFETY FIRST" there are no second chances lifting a 100,000 lb house with you under it