I dont have instructions for you how to swap the display, but I can say the following: I had an Samsung Omnia, and the resistive touchscreen there was very bad. But there was an replacement which seemed to work much better. So I bought a new LCD + digitizer and started to disassemble the whole phone. I have to say, I'm not very good in disassembling electronics or reparing them. But after an hour of hard work where I sometimes had a bad feeling by pulling out the different flat-cables, the touchscreen was replaced and worked like a charm.
What I wanted to say with my post: I think you can do it, if you have the right equipment and some time. Good luck.