G'day Rob.
Their pretty straight forward to fit, and well worth it (there are cheaper ones on the market). Remove the 4 nuts hold that old one on and remove the plate. You will need to remove the studs and clean the face. Now install the gasket, strainer plate, gasket and sump plate. Easy peasy. You will probably find that after sitting for 2 years the sump is full (wet sumped) of oil, so have a good 2Lt container under her when you remove the old plate. That's why the new plug type sump plate is good.
The sludge trap is a big job (full motor strip), so you won't be doing that straight away. Once you've done a good look over and filled the oil tank (leave the filler cap off), start her up. First check is to see oil returning to the tank (may take a minute). If it does, put your helmet on and go for a short (5 miles) ride. Listen for any Knocks on acceleration or overrun.
Report back with any questions.
Cheers
A10gf got in while I was typing (one finger).