It was one of the easiest things Ive done. A ton easier than when I installed a complete roush turbo kit on my 01 zx3. But it happened when I was on Hwy 232 in Mid TN. I usually ride the crap out of my bike on that road but this time I took my car. I tried for the 7 min club. Yea that didnt happen. But I believe the stock motor mounts were to mushy under the stress of hard cornering and allowed the engine to move more than it should have and snapped the stud. But its all good now and I havent drove the car any where near as hard as I did that day. (once in a lifetime thing)Curious....how did that stud get broken to begin with? I've always been super careful removing nuts/bolts on engine pieces. I use penetrating oil, a hand-held torch to heat the thing, and patience. As you found out, replacing a broken stud is a pain.
Frankly I wouldn't recommend a beginner attempt such an operation....the odds of failure are great. The use of reverse drills and extractors combined with heat, gives you a chance. As a last resort, you might be able to drill and tap a new hole.....install a slightly larger stud, which might require a larger hole in the mount.
Anyway....this is not an operation I'd like to do in my driveway, particularly if it was my first such attempt to repair a critical broken stud. My 2c......