Had to post on this thread!, as during the summer nearly all my fishing is at night, I feel I can offer you some advice here. I feel fine out there at night on summer nights, after a few trips and your confidence with your equipment and route builds, its not much different to being out in the day, it never really that dark and on some moon lit nights you can see for miles! fishing can be great too! Pots and nets while traveling are my main concern/ hazzard !
But in the winter I have found night fishing can be a very different experience! the weather can change much quicker, the temp dropps lower quicker, the sea just seems a little more uneasy and the fog/mist can be a pain mainly near the rivers, channel bouys are gone around christchurch and the rivers is normally belting out the harbour. With branches and trees being swept out to sea! Apart from that it is just more eerie in the winter, I feel on edge out there and only go on the best forcasts. I sure the rewards are there to be had just not worth risking sometimes.
In the solent or poole harbour would be a lot safer in winter and would be your best bet for a maiden trip!
good luck
James