Jim, you have gotten some good advice here. Markus and Ian are dead on in their advice. My only comment would be to hold on to your job for the year you have left to get full benefits. During this year which will go faster than you think, I would get all my ducks in a row so to speak. As Ian said get your marketing, accounting, insurance, etc. all ready to go. Do a few jobs during this year so you can just step into this without missing a beat. 5% is 5%. That could pay your health insurance.
I have a clock repair business with woodworking on the side that I do part time. I repair a lot of clock cases and build clocks for sale. I have often thought of quitting early and doing this full time. I sat back, have watched and talked with others who have went the early retirement route. 5% doesn't sound like much now but as the years progress each one of these people I have talked with said don't be silly like me and quit with 1 or 2 years to go. There will be seasonal flucuations where when I first started I am glad I had my main job to get me by. I don't worry so much about it now but will finish my 30 years then will retire to do this full time. I have about 2 years and that will go pretty fast.
Just my $1.298.
Bernie
Never put off until tomorrow what you can do the day after tomorrow.
To succeed in life, you need three things: a wishbone, a backbone and a funnybone.