Also do check out your position in terms of disability legislation. Some jobs may have obvious restrictions for driving/machinery, but employers are required to make what are called 'reasonable adjustments' to enable people with disabilities to work. Hence, if transportation to sites is an issue, an employer should provide support (other drive, taxi). It may be the same with chainsaws. You can do the rest of the job, but not operate a chainsaw so some else does does that bit (not necessarily a problem if most of the work is in small teams).
Do check out your rights in this area. This
link may be useful.
And good luck!