Controlling a small power tool is no more difficult than using a pin vice – but it does take practice to get to that point.
Choose a fairly light one if using it mostly on figures, you don’t need a lot of power. I use a 100w corded one and I do sometimes think I should get a cordless one but I’m, used to using mine now. Mine is powerful enough to use it as a tiny lathe so you possibly don’t need one that powerful.
Dremel are good quality, you don’t want to buy a cheap one, they cause too many problems. Make sure you get one with a chuck and not collets – much easier to use.
Also don’t be tempted into buying a whole load of kit with it, you will be surprised at how much use you can get out of a few basic tools. Add more later as you have the need for them.