You can use 1.5 mm. It will be just a bit more painful and since you are a "beginner", I thought a less painful roller might be better for you.
You can use the roller around the eyes except for the upper eyelids. The upper eyelids must not be rolled due to the risk of injuring the eyeball.
When you roll under the eyes, stick to this:
When you put your finger under your eye, you'll feel a bone. Do not roll closer to your eye than where that bone is. Pull/stretch your skin downwards from the eye with your other hand and roll it with the other.
We sell a very small narrow 1.5 roller that is very easy to maneuver around the eyes and above the lip area. This roller has fewer needles and should not be used on large areas (such as the whole face) because it blunt faster due to the small number of needles it has.
You can roll around the eyes with a normal size roller as well.
You can for example buy a 1 mm roller + single needles and use the roller on your scars and around the eyes and use the single needles only on individual scars.
Dermarollers are also very good to rejuvenate sun-damaged skin of the décolleté, forearms etc. You will only achieve results after repeated rolling. Pre-treat your skin with dry brushing or scrub with fine salt (in the shower) and apply vit. C.