Replace Expansion Tank

[cheekyducky]

I have a 2000 C230. The coolant light came on a few days ago, I checked, and the hose that attaches to the expansion tank was off (and there was no coolant in the tank). I can't attach the hose because the nipple on the tank snapped off. I ordered a new one, but wanted to know if there's anything tricky about replacing it. It looks fairly easy at first glance, but I want to make sure I'm not getting in over my head. Any tips would be hugely appreciated, especially on how to drain the coolant.

Thanks so much!
Shannon