Septic Replacement: Can I Do it Myself?
Replacing a septic system is a really crappy job, you'll want to let the pros handle this one.  A job like this requires special licenses, permits, equipment, and knowledge. It may seem like your just digging a hole and dropping a tank in it, but there is a lot more planning and hassle involved.  It's worth paying to have this done, rather than doing it yourself and then finding out it's not right and has to be ripped out and redone.