How would you go about chaning discs when it asks you. I used to always have this problem that it sometimes does not recognize the 2nd disc and I have to change back and forth.

Well if anything, the official Turrican II backup disk posted on Factor 5's website is contained on only one disk file. So if you're running on something other than an official machine, this might be useful!

Otherwise, I don't think I can help you since I (sadly?) never owned an actual Amiga, sorry ;-;

The images on factor 5's website are bugged funny enough; turrican 2 has no ending sequence, so the ipf or extended adf image is preferred, also single disk. You could also do a WHDLoad install.