Have to agree with with wizzard here - absolute confidence in your IFR/night skills - your company must allow you to build this by practice! Nothing worse than feeling your heart thumping whilst on approach - only truly realise how much effort it takes after a very high level of skill is needed and you are in bed trying to sleep and rehashing the approach. Do not push your limits. Fly safe!
ps. worst time to fly an approach is actually not at night - but that time when sun is just under the horizon, lots of fog and your eyesight is working over time trying to adjust - again keep your ifr skills really sharp and keep the airspeed in control. Although not recommended keeping a very nice bottle waiting for the home run helps reduce the tension!