The small-ish amount of money I pay an accountat each year makes itself back many times over in deductions that I wouldn't have thought of or even heard of. A good accountant (like a good lawyer, good plumber, good electrician, good builder, etc.) is worth their weight in gold.
If you're just starting up, at least sit down and chat with one. Many will offer a free introductory chat if you ask.
(I use an accountant in Portsmouth - even though I'm in Northern Ireland - if you'd like a recommendation)