Unless you plan (have a serious business plan) to grow a substantial portfolio as a specific business I would suggest you don’t start in this field. Sell the house and find an easier investment / income source.
If you are totally reliant on tradesmen, have no / little knowledge of the letting business and court procedures you could be on a hiding to nothing. It is a very risky business, and future legislation will not be in your favour as a landlord, nor is the legal system or the associated bureaucracy.
This business is not an easy fast buck, as many tenants would have you believe, it can be hard work if you are self managing, expensive, legally onerous, stressful and demoralising. Think hard and be absolutely certain you are the right personality to cope with it.
Conversely, you could get a fantastic tenant who is clean, stays for years and never defaults or causes problems, even from DSS (with a guarantor). But, that is the gamble you need to be prepared to take.
You obviously have some knowledge of the legislative requirements, but knowledge of the building / maintenance is advantageous so as not to be totally reliant on tradesmen and what they tell you.
You need to be a good judge of character and see through the prospective tenants polished presentation at viewings, they can lie. As others have said, ignore sob stories or any excuse to deviate from the requirements / contract terms.
My portfolio was built from wrecks with personal sweat equity to enhance the appreciation and ROI and to avoid high leverage, with hands on maintenance & management over many years until retiring overseas. It has given us a decent standard of living but at a considerable cost in time, physical damage, even violent abuse, and grey hair. I’ve also seen “investors” who leveraged to the limit go broke.
I currently have an excellent letting agent, but I’ve also had nightmare ones, no guarantees there either.
Just my personal (42 yrs. experience) opinion, for what it’s worth. Good luck.