I'd be leery of people who claim to be finding thousands of dollars of deductions that other accountants miss. Also, the 1-800-Accountants sounds fishy to me. For CPAs, my state has rules about firm names that that name doesn't seem to conform to. So in my state, I'd suspect that a company with that name may not be providing good quality services.
Fwiw, I think the key steps are tax planning and setting up your accounting system. As others have said, tax planning is something you do ahead of time, not at tax time. Similarly if you get your accounting set up well at the start, tax time is automatically pretty easy.
If you're consulting someone, maybe have them run through the categories of expense and deduction that will be relevant, and set up your bookkeeping to record those from the start. Or to save money, maybe just buy a tax software subscription, run through a mock filing with fake numbers, and note all the "questions" - data categories - it asks for. If you ran your example correctly, you should then have all the categories (account names) you want to use when recording and documenting your business expenses and income. Maybe a cost-effective way would be to set up your books accordingly, then have a real CPA check to see if your setup looks accurate.
Will defer to any comments by active pros in the field, or other knowledgeable parties.