It does sound great to get paid to hike!
I agree with the caveats regarding first aid training, etc. I don't know if the organization through which you're doing this has a policy or requirements.
I think I would also look to see how much you would make. Can you make a living at it? If it's only a smnall amount of $, and you still have to work your regular job, it could become a burden.
How good it is also depends on the groups / clients you will be leading. Trip leading and guiding are jobs, and you have to do the job you're getting paid for. Sometimes, you get a client at the level where you can "have your fun," go your pace, go to difficult or interesting destinations, etc. Other times, you will get people at a level where your job is full time instruction and care, and minimal actual hiking. Probably good to understand what the mix will be before you get committed, so you know what you're signing up your time for.
TCD