I think the problem is that you feel people are being negative because they are not agreeing with you (eg I quite agree with Aziz - I have been an accountant for 30+years so it is all easy to me, but I would not attempt electrics etc - nor would it be legal for me to do more than the basic electrics - and because he didn’t say what you wanted to hear, you called him stupid, which was just rude and unnecessary!).
As I said, it is fair game to do your own self assessment if it is simple (but even though the form may look the same year on year it does not mean that the rules haven’t changed, so you need to keep yourself up to date and if you just copy from last years, you could end up in trouble, I did a tax return for a new client last year who had done his own the previous year - they had not restricted the interest, but had also not claimed repairs to the kitchen that they could have claimed, so I saved them money overall. Just got another client a £3k tax repayment going back 3 years).
Limited companies are a completely different thing, and from your reply to Tracy and Neil it sounds like you may not understand that.
Some of the big players in the mortgage market have refused to go into limited company lending because they feel that it is to easy to go into without getting proper advice (https://www.mortgagesolutions.co.uk/news/2019/12/09/bm-solutions-avoiding-limited-company-as-landlords-not-always-getting-right-advice-rickards/).
A company is a separate legal entity, not an extension of you. You have to do accounts in statutory legal format, with a full balance sheet. You can’t use cash accounting, so you have to calculate accruals and prepayments (ie if a tenant’s rent period starts on 30 March and your year end is 31 March, you have to defer the rent that relates to the period after the year end. Same with costs like insurance - you have to match them to the period). The accounts have to be filed in iXbrl format, along with a tax computation and return. Money that you take out of the company has to be salary, dividend or loan repayment - there are strict rules about borrowing from the company. Accountants can also advise on things like whether you could save tax by running a payroll as well as stopping you from getting into trouble for doing things wrong.
If you really want to do your own company accounts and tax return, I did point you towards some software - have a look at Taxfiler. That will do the accounts in statutory format, but it won’t tell you if the figures are wrong, or if you are using the most appropriate accounting standard.
I believe that you can also file accounts and tax via the Gov website (they did stop the service a while back, but I have just had a look and it looks like it might be back now: https://www.gov.uk/file-your-company-accounts-and-tax-return). Unless they have improved it since I last used it, it is not very user friendly.