For me, I would say an very easy fix, but, all the much more challanging things ive done before, you can't really compare.
If you have the tools, and a wee bit of technical background, it should be pretty straightforward.
I have not really noticed the blaster having an extremely heavy clutch (it is actually quite normal/comfortable for me)...
Is it maby upgraded? Stiffer springs?
O, and yes, as BLAASTER said, try and match the cylinder displacement as close as you can, if possible.