Rough cost of a job if anyone can give a guess from experience

Hi all,

I'm removing my current hot tank from ground floor of bungalow and installing a 200l or 300l tank in the attic. Also removing an open fire to install a stove that heats the water and rads. Also removing the old boiler and replacing it in a different location with a new boiler. A stove installer is putting the stove in but the plumber will plumb it. I have requested to complete all the donkey work myself like chasing walls and floor and basically leaving it ready for the plumber to just install the pipes and tank and boiler. So it's just the skilled work required by them. Could anybody throw an estimate out there? Just trying to make sure I have the funds if possible. Thanks