First things first, you need to find a landlord or agency that is willing to accept housing benefit, and that is hard to find.
My agency wants the hb paid directly to them from the council and I needed a a deposit and a months rent in advance too. They also needed a guarantor to be liable if rent isn’t paid in full (arrears)
My housing benefit covers part of my rent and I have to pay a top up out of my benefits. My hb is £392 and my rent is £537 pm. If I didn’t get PIP then I wouldn’t be able to afford to live here.
Once a year the landlord/agency puts the rent up. Housing benefit is frozen and has been since the crash.
Good luck, you are going to need it!