As Geo suggests they normally screw off anti-clock wise. When you un-wind & it is thumping it is almost certainly that the spring is not attached to the arbour. This is normally the spring hole that attaches it to the arbour is split. If you can loosen the plate a bit to gain access the barrel arbour then it needs holding while unwinding.
WARNING if the spring it not broken & it is still under tension these can do a lot of damage to the clock & yourself.
I have not worked on this particular clock but the springs can be repaired if the spring is not to badly split. You have to cut off the damaged part & punch a new hole. If not mainsprings are generally available in most supply houses.
Both , but mainly using newly dressed short tweezers. It's important, as Fried says, to use short tweezers - less wobble. I bought an expensive used set from Otto Frei and have found it a worthwhile investment.
It is better to find a girlfriend from the country you need the language...she can teach all the bad words! :)
Ok, I also use android so I'll wait a bit longer!
The movement will cost you just under £30 from Cousins - plus postage of course - so that might be a better proposition than trying to diagnose and then repair it.