Installing a Gas Heater in a Jayco Swan

G'day All

I remember seeing some time ago a detailed post on here about fitting a gas heater in to a Jayco campervan. Yes I know I will need a qualified gas fitter to do the gas connection, but I am contemplating buying the Dometic Gas heater kit for $1600-$1800 and fitting it myself. I am not experienced in working on caravans, but have a large shed with all the necessary tools, and am fairly handy/competent when it comes to DIY, I am a hands on site engineer by profession.

Has anyone else done this at home, how difficult was it, how long did it take, and did you wish you had spent the extra $1000 to $1500 to have it professionally installed?

Thanks in Advance

Snowy