Been down that road too. It's a lesson you won't forget.
But, I will say that what counts is "experience", not necessarily "profe$$ional". I have tried to get riggers to move 8000 lb machines and couldn't get a call back. Guy in the next town over bought a brand new Okuma VMC (more than $100k) and took months to get it moved into his shop because of re-scheduling and hit/miss with riggers. It seems good riggers reject anything "residential". And cheap riggers, well, straps around overloaded lift gates says it all.
One alternative for anyone doing this is get a knowledgeable friend. First stop, check here! (Might be a fun opportunity to make a new friend). If you've never done anything like this before, it's a great opportunity to learn. Secondly, IF you can take the time to communicate with someone else, and you come up with a plan, talk through all the what-ifs, and then proceed, that 2 person approach gets through a LOT of the things one person would miss. Kind of like 2 pilots in the cockpit of a commercial airline, to double check everything.