The most important thing is to keep cool. When you do things out of the ordinary, it is extremely easy to forget something vital, ie forgetting speedbrakes out or not armed etc. So if you are 330 at 18 nm out lvl at 3000 AGL for a straight in 3 degree approach, you will reach 10 nm with a speed between 250 and 240, perfect time for F1. Flap 1 green light, F5. You will then be at 7 nm descending with speed around 200, low drag to 5 nm gear down wait for 190, F15 and so on. Rather 30 seconds extra time than risking an overrun or similar undesirable event.
Alternatively if you are very high, you can get everything out F40 fully configured in ALT hold, drop the nose with speed Vfly and you will be able to loose 1000 ft for every nm. Plan at least 1000 ft buffer to get established, so 9000 AGL at 10 nm fully configured will work provided you keep the speed between Vref and Vfly idle thrust (fly manually as the AP most probably will capture a false glide beam at 6 degrees).