Hi everyone. I bought an old house and property 3 years ago and have been renovating it ever since. There is a 100yr old barn on the property that is sinking into the groung in places due to the cedar posts sitting on the dirt.

I need to jack up the barn and place concrete footings under each post. Does anyone have any good advice for this? ie. what kind of jacks, how deep to dig the holes, how big to make the concrete blocks, how tall to make the sona tubes ... etc. Is there an online tutorial for such a thing?

Here are some pictures of my barn and the posts: