In that case, large container that can be tipped into the big hole periodically. You can always dig the new hole in stages rather than all at once too.

Also if manual labour is off putting to you, the whole idea is probably not something you are suited to.

Not sure how I could legally do it here but the idea I like is going half way into the wilderness. Buy some woodland but have towns nearby you could pop into for some supplies occasionally and still keep a part time job. Difficult part is legally living in your own woodland.