So can anyone become an accountant?

 Hi I have this burning question for quite sometime now but cannot find any reasonable source with a reasonable answer. 

I am an ACCA affiliate not yet finished my three years practical experience requirement, so bit short on expereince. I have extensive knowledge of both Personal and Business tax.

I was wondering can I register myself with HMRC as an agent to submit their self-assessment, CT600, partnership and P11D form etc?

I understand about the indemnity insurance but dont wish to advise anyone, however would for example not utlising losses effectively resulting in increased tax borne imply negligence? 

Just want to trying start my own business wanted to know the implication and how to workaround it if any?

Many thanks.