I've had an easier time with the clearomiser, but after about a week it's starting to leak a little bit. Needs a good clean, but I have a mini nova arriving hopefully tomorrow.
As Chrissie mentioned, use the condom method to fill first time. Then I just patiently keep adding drops in from the top, one at a time letting them soak in, till the top looks like it wont take any more. Give it a quick blow through to clear any juice in the air tube, and get vaping
As I discovered, you know it's well filled if you get a nice 'snap crackle pop' sound when you're vaping. I also learned that it was too strong for me if I inhaled, so I don't do that much now. Just hold it in my mouth for a bit and then out through the nose for max nicotine absorption.