You have to love the job. I did at first, then I came to hate it. I sometimes see people on a project, and I shudder thinking of doing it again. The pay is very low compared to responsibility. My particular specialty was construction layout. I fixed the engineers fuckups, and did a lot of re-engineering in the field. Mine were the last set of eyes that made sure something was right, and hundreds of thousands of dollars were riding on me being correct. You get the blame when things go wrong, and little of the glory when things go right. I was a god on the jobsite, but that and a dollar will get you a cup of coffee.
On the other end, you could be out in the country looking at 2,000' of greenbriars you have to cut through with machetes and brush hooks. You're looking for property markers that haven't been seen in 100 years, and dealing with irate neighbors.
On the plus side, you get to see a lot of nature, and finding an old glass dump in the woods was always a thrill. You get to explore old abandoned houses, and your time is very flexible. It's also a unique blend of thinking and manual labor that you won't find in many professions. You get to dress like you're homeless, and if you don't feel like shaving, you don't.
I'd have a hard time recommending the job, but if you have the right disposition, and don't love money, it can be a great career.