On small bosst you might get away with the stock clutch. I ran 9psi on my stock ITR clutch and it held it all right.

Extra injectors are a cheapo quick alternative to four bigger injectors.
Do the fuel system properly as this is one of the most vital partsin keeping your motor alive! Don't go cheap on it, plus you need a good tuner!
Eg: 7 psi, extra injector = risk of engine damage, medium power gain.
9psi, ems, bigger injectors, fuel pump, fuel reg + good tuner = less risk with more power than the fisrt set up.
having a small turbo or big turbo has nothing to do with anything. You have to make sure of what power goals your after, your budget and who you trust.
Once you got that you will be able to determine if you can fullfill your cars needs. If you want to have a go at going bodgey by all means do it and learn the hard way. Take some advice from people with experience not thoughts.