The instructions suck. Pull the whole burner assembly and it makes access to the screws much easier. Be sure an service the combustion chamber whilst you have it open.
It's not so much a case of "You got what you paid for", as it is a matter of "You DIDN'T get what you DIDN'T pay for, and you're NOT going to get what you thought you were in the way of comfort". Borrowed from Heatboy.