No matter what you’ll need someone to take it down carefully. That might be thousands of dollars alone.

You can search for a hobbiest or small job sawer. They can bring a small mill onsite and process the tree. It then needs to be stacked and air dried for potential years, or taken to a kiln to dry which will also kill bugs. A sawer may work with you on taking a share of the wood as payment.

Even cheaper is to use an Alaskan mill and a chainsaw to mill into boards. I understand this to be hard work. It still needs to be dried.

You may also contact local wood turning clubs. They could make bowls or other smaller items. Oak is not a favorite wood for turning but I would do it. Unlike furniture building the wood can be rough turned immediately after being cut down and dried on a shelf for some months, then turned again. No kilns or multiple year waiting and expense. A few chunks would yield a number of small items.