Do sole traders trading shares for income need an accountant ?, page-2

If you keep detailed records and feel comfortable/competent lodging your own tax return, then do so.

If you maintain good records then even if your are audited there shouldn't be a problem

You say "thousands" of trades; I would strongly suggest Excel spreadsheets

Just my opinion

I was classed as a trader for seven years and turned over millions a year and was never audited