Actually, it's not all heavy. Some of the equipment fits in a briefcase. But there are hazardous substances and a possibility for exposure to radiation...if you're not careful or properly educated. It took me several years to learn...you won't take as long as I did. Scuba certification is a bonus. Clients are government (- least favorite) commercial and private enterprise. I'm becoming unwilling to travel anymore...openings exist.
I've started a related biz, much simpler and decent money and no travel to far away places... shopping for my helper/replacement right now. (edited)