When the galaxies collide, I don't think you're going to feel anything much or hear a big, loud CLANK!!! or anything like that. It should be a sort of gentle mixing. It will mess up the nice whirlpool-like symmetry of both galaxies, but I don't see that it would really affect individual solar systems.

In fact, other than astronomers, I don't think most people would notice much of anything. Of course, the night sky will gradually start looking a bit different over a period of a couple of million years (at least), what with passing stars moving through constellations and their gravitational fields pulling them this way and that, and disturbing their locations. It'll bug the hell out of astrologers!! However, it will keep astronomers ecstatic for millenia! They'll learn lotsa new stuff.

But for most people, it will be a non-event. Sorry!

Here's a collision in progress:    "Captain Kirk, take a look at this!"

Don Firth