Speaker repair...is it easy?

+1 millercarbon. It’s not that tough. Keep it centered as best you can and you’ll be fine. I did this to my old jbl l300 and they’re still golden after 10 yrs.. Watch a YouTube vid on it. 

I'm not sure it's something that should be attempted. Even the slightest deviation off axis or a minute uneven tension could be enough to compromise the sound.

Just being cautious.  

I removed the solder and blown voice coil/diaphragm from my Mezzo Utopia's tweeter and resoldered in place a new voice coil/diaphragm.
It wasn't easy but I did it and it sounds perfect.

Do not use Gorilla Glue. It's permanent. If the surround ever goes, which it shouldn't being rubber, you will have to replace cone and surround, because there will be no getting them apart. Just buy a proper kit with shims and everything else you need. It's not too hard, but it's deff. not worth the risk of f'ing it up. Use a lazy Susan if you have one.