I used to use the wooden sharpeners as shown on the photo but the past years I have been unable to as they are no longer sold in the local art shops. Instead I am using some very cheap metal sharpeners bought in low price shops. They work alright but only for a very limited time. On the bright side they are very cheap and you can just throw them out once they are used.
I would however recommend the wooden ones any day. They last longer and works the best.
I use a kneaded eraser which you can find in most art shops as well. It is my all time favourite eraser as you can change the shape and you are able to make it very sharp for thinner hairs.
I never use regular erasers as they tend to damage the paper and I just don't like the feel of it.