Looking for advice regarding due diligence on a budget. How do solo searchers on a tight budget handle due diligence when they have a business under LOI?

I am going to use the SBA to acquire a business but Im really stuck on the diligence process. I dont think I will have the money to spend on an Accounting firm to do the diligence work. The business I am looking at is $200,000 SDE at a 2x multiple and I have enough for the 10% deposit plus 6 SBA payments (savings I am required to have).

I was thinking of doing the diligence mself but I am not really experienced and fear I may miss some important items. Any help would be appreciated.