No one can say without knowing how complicated and how much stuff is comprised in your book-keeping.
If there are piles of invoices/receipts to wade through, worse if there are personal stuff in there, it can take many hours/days for a book-keeper or accountant to sort out. Even worse if some are paid by cash, some by personal bank account, some by credit card etc. The messier, the higher the cost.
Rather than trying to teach yourself book-keeping, you could always just spend some time sorting it all out yourself, so the accountant/book-keeper doesn't have to wade through all the irrelevant stuff. Sort it all into piles, i.e. all phone bills in one pile, bank statements for each account in separate piles, extract and remove any private/personal stuff not relevant to the business, etc. You'll have to do all that if you decide to do your own book-keeping.
Using software isn't a magic bullet. If it's all a mess, you'll just end up computerising a mess - i.e. "garbage in, garbage out". Sort it out first, make sure it's all complete, make sure you can cross reference each item of paper to the relevant bank statement, etc.