This checklist is copied from a post we made on ebuild. It is a summary of the authors' collective wisdom. Unfortunately the links are dead - but the author's name is always listed. And since most of the usernames have been preserved, they are still relevant. This (and every) checklist will benefit greatly from your comment and experience.
Bring a tame fitter with you / or ask for a recommendation from him or her. (Triassic#10)
A digger from a hire yard will be better looked after