The batter ingredients can be easily mixed with a fork, but should you prefer, a stand mixer or electric mixer can be used instead - although not necessary!
If you fill the cupcake liners more than halfway, like ⅔ full, they will create a very rounded dome during the baking and they will be harder to frost (plus, you will have fewer cupcakes with more calories!).
For ease, try using an ice-cream scoop to fill the cupcake tins.