given that I the wife the sister and two brothers in law all have 1100's and none of them spanner worth a damn I have done a few changes, did what your proposing on my bike as was very short of cash and at the time not short on time, wouldn bother again. I knew it wouldnt last long but needed a clutch quick and didnt have the money for the full kit, an was right lasted about 2500-3000 miles but got me out of the jam.
I can just about do the whole job in and out in about 4 1/2 - 5 hours, but wouldnt waste that time again. Get all the parts and do it once unless as people have alaready said, you have more time than money in which case crack on.
If your interested then the Lucas Sintered clutch plate works very very well, and I am told the oil resistant one is good two, both about 100-120, and to my mind worth spending the money on over the standard clutch plate.
And as already said BEFORE you start make sure you have all the bit, the right replacement bolts, spline lube, a clutch alignment tool (even if you make one out of dowling and masking tape, which I did first time), read the how to off the site here, as it is damn good and by far better than any haynes manual.