Been looking for the Peanut but we dont seem to be able to get it here in the UK.
I asked the trainer of Maisies obedience class (she is also a veterinary nurse, and owns a pet shop) and she said the safest way for an amateur is curved scissors. She says there is too much flesh/skin to use a trimmer when you dont know what you are doing.
These are the kind of scissors she had, and showed me how to use them.
Standard Curved Scissors-Hyperdrug
(Blunt ones)