We have completely renovated our house over the past few years but everything was done by tradespeople, we haven't lifted a paintbrush (mainly time/ cost benefit - it was more economical for us to both work FT and outsource) and tbh partly because we are not handy people. At all. 
The only room that needs to be done now is the hall and stairs. However, the money has run out and we cannot afford to pay a decorator at the moment (our usual one is booked up for months anyway and now charges a ridiculous rate) plus I have some more time available as I have gone PT at work.
The walls were skimmed and a mist coat applied, we shoved some pictures and a mirror up to tide us over but it really needs doing properly now. It is annoying having a lovely house but walking into a messy hall.
Can anyone recommend any you tubers to follow or forums where I can ask basic questions and not be laughed at? I have fixed many things by you tubing 😂 but I don't know where to start with basic DIY and I mean basic - how to fill holes, how to deal with cracks between the skirting and the wall.
I also have two column radiators that I will need to paint behind - how?
I am actually really excited to try to do this and I think I will be fine once I know what to do but starting it feels pretty daunting.
TIA