Should I quit corporate job to start business?

I am a recent graduate who has been working in IT for several years. I enjoy supporting systems, deploying new infrastructure, and can troubleshoot a wide variety of IT problems with a wide variety of technology. I am coming up on my year anniversary at my big corp sysadmin job and would like to leave after this. I would like to move to my hometown, a large city. I am waiting a year so I don’t look like a “job hopper” in the event my plan fails.

I am thinking of not finding a job in my hometown first (it’s impossible to interview with a 9–5 anyway) and starting my own Managed Services\Consulting firm. I’ve had this idea for a while. Why IT services?

*I have a passion for this line of work.
*SMBs (small-medium business) need these type of services. In a large city there are a ton of SMBs.
*Startup costs are very minimal. I do not need a storefront or thousands of dollars in inventory. I have tools and hardware. Clients would be paying for their own systems & upgrades which I order on demand. I have budgeted a few thousand to start up just in case.
*I spoke with sysadmin friends who trolled managed services companies and got quotes. I would have no issue competing with their very high prices.

I am very frugal and am not one who cares for flashy things. I have no debt, no obligations, no car payments, and $25k saved. Assuming I get ZERO work I could theoretically live for at least 1.5 years.

One thing I’m scared of is getting clients. I have no contacts that are SMB owners. I am a great seller and am confident in my marketing plan however nothing is 100%. Since I work a 9–5 I have no time to test my marketing plan. I couldn’t realistically meet my obligations working those hours and most SMBs I would sell to are closed after 5 or their higher ups are gone for the day.

My plan is to just cold visit every SMB (offices, shops, doctors, lawyers, etc.) and just pitch my services to the owner. I will do what it takes (within reason) to win the client. I will beat their current MSP’s price if applicable, ask to inspect their systems to point out issues (non redundancy, no backups, lax security), offer trial periods or a free repair, and if they are not looking for Managed IT leave my card for on-demand break & fix support.

If I am in need of cash I could always take a contract job. I never did contract through a staffing firm but I hear the jobs are not hard to get. IT seems to be a field where I do not have to worry about never ever finding a job again if this fails. Not sure how I would explain my employment gap though.

Should I go for it? Any advice.