Is it strictly necessary to have an insurance or some sort, being a carpenter / mason?

I have a question for carpenters. Share please your opinion about worm drive saw, is it easy to use with one hand? I am thinking of buying Makita 5007F 7-1/4-Inch Circular Saw. Is it heavy, well balanced etc? Can you compare it with sidewinder? I am using it now. Or you would recommend both for different types of work?

Absolutely vital to the construction industry is the carpenter, who constructs and repairs wooden objects, buildings, and other structures. Required for this job is the proficiency in the use of various tools necessary to the work of carpenters, both hand tools and mechanical ones.
Necessary skills for the job include the ability to interpret drawings and diagrams and to take accurate measurements. Knowledge of mathematical principles and the physical stamina necessary to work crouched in awkward positions or standing up or for long periods of time is also essential.
Most employers require applicants to hold at least high school qualifications, although some may require formal schooling from technical and vocational institutions. The average salary for this position is around £23,000 per year.