Igni, I think it's personal preference. I generally use a self-tanning cream (Le Tan), but I have also used a spray with great success. I think it's really important to ensure that you have no rough, dry patches on your skin beforehand. I use a loofah and moisturise (but not too much) beforehand.
If you're a bit unsure, you could try one that's coloured so that you can see where you're applying it to ensure it's even. I know Ella Bache does one like that (but not sure if it's available outside Aust) and I'm sure there would be plenty of others similar.
I'm not sure about tanning your face though, I've only ever F.T.ed my body.
Good luck Igni
