You do need an accountant - you want a due diligence report doing on any business you are thinking of acquiring - just looking at the accounts and thinking 'hey, that's a good profit' is pretty meaningless.
As a cautionary tale, one company we were looking into for a client had a great p&l account - until we dug deeper and discovered they had been treating one income stream as exempt when it was in fact subject to standard rated vat. This meant over the four year period the company had under declared hundreds of thousands of VAT. The vat liability wiped out the balance sheet value and that was before penalties were calculated.
You also need to understand the balance sheet - for another example, profit was great, balance sheet was poor - 80% of turnover was included in debtors (ie, they were due to be paid, but hadn't yet been) and there were huge cash flow problems due to poor financial management and not chasing up amounts due. The director had been putting cash into the company - which meant a huge directors loan account that would need paying out.
You will also need to consider the business structure - will you be purchasing shares, or perhaps more sensibly hiving the business across to a company you've set up?
You need to think about indemnities, particulalry in an industry which has such a high risk of litigation - if the company is sued due to an incident that occurred prior to you taken it over, the company will still be liable - or as in the example above, errors are discovered.
None of these things are insurmountable, but you do need specialist advice.