1.9TD power increases are easy enough for DIY - it really is a case of 'If I can do it, anyone can'.....
The ONLY cost is for an intercooler (if you decide to fit one), a boost gauge (you REALLY should fit one) and maybe a decat (if you get a replacement pipe, rather than knocking the guts out of the one already on the van).
Other than that, as long as the van is maintained well and a few basic checks are done before starting, there's no reason to pay anyone for doing this, perhaps the most simple power improvement going.
Do a search, as there's been LOTS of work done on this engine - if you can't find any threads, then look on my build diary for a decent article to get you started.........
I have a 2.5 TDI and have fitted front mounted intercooler bossio 502 sprint nozzles and a new turbo (after the other went missing). It needs the full map but will get that done by chip wizards. This van is just basic project power to be honest.
I have another that will be a bit more special I: but I'm working 24/7 at the moment so can't find the time to get my teeth into it.
The engine and box are out and turbo on the bench.
I won't be going to a garage again (first and last time) apart from the live map that I can't do.
It's only nuts and bolts. The forum is a wealth of knowledge and help. The 1.9 is the easiest to get some extra oomph from. Get your hands black and enjoy the fruits of your labour.
Piece of cake to do yourself, dont waste your money. I have done the works including having an AAZ pump fitted including the new boost pin and it goes like stink. The pump was the only part i didn't fit myself and; incidently its well worth having one fitted if you can find one.