Hi Edd, welcome to OOF

I did my 2.6 CDX back at the beginning of the year. took me 4 days in total, if you are switched on then you should be able to do it with few issues, i consider it to be a bolt on job really.
The only advice i would give is to get another inlet manifold and drill and tap it for the nozzels, that way you reduce the time the car is off the road, plus if you get it wrong then you don't have the stress of finding one in order just to get the car up and running again.
I have done just over 20,000 miles with mine and had no problems at all, mine is the same kit that Kevin and Lazydocker have in their cars, excellent value, this is my second Omega with that kit on it
this is my thread when i did my conversion
http://www.omegaowners.com/forum/YaBB.pl?num=1211590970/0there is a wealth of knowledge about these systems here, just ask away