[yarcob]

Also, noone will notify you when a sales tax or VAT law changes -- you have to find it out on your own :)

It's not an impossible problem, it's definitely doable, but I'm pretty sure you need a couple of people and won't be able to do it all on your own.

If you're just a small seller, you can "fly under the radar" and just handle taxes in your own jurisdiction.

But as you get bigger, you need to handle every place that you sell to. Especially if you resell your solution to others.