Ultimately the answer to this question is that it is up to you. Legally you are not required to have an accountant you can submit your own accounts or tax return but we would encourage you to consider all of the following points before you make that decision:
1. Recognise your strengths and focus on what makes you money.
2. Understand that the limitations to your knowledge will cost you money in the lost value of your time and in actual tax paid.
3. Remember that accountancy fees are tax deductible.