Before your display it is recommended that you elect someone to be in charge. I would then say their duties are primarily to ensure safety by checking that the proposed site is safe and adequate for a fireworks display i.e is there no petrol station next door? or no overhead electric cables etc? is the site near to the flight path of an airport? All things to obviously take into account. Plus on the night of the display I recommend informing the police and fire brigade or any other appropriate person that the display may affect.
Now to the actual display firstly please ensure all fireworks are secure and pointing in the right direction before igniting, if it's a display then I recommend laying the fireworks out in an order to suit the firer (maybe an S type formation) typically this is appx 4 metres between each firework then 4 metres back to the next row. Once again ensure all fireworks are safe and secure by following the instructions usually this is burying to a marked line on the firework or alternatively fixing to a stake in the ground. Rockets can cause most problems so please ensure there is a good fall out area. I must add that I feel it is much safer to lay out your fireworks rather than take them out 1 by 1 as once laid out they are in the safe and secure positions intended so in the very unlikely event one firework lights another “so what” its safe secure and pointing in the right direction ! If necessary you could place fireworks in plastic waterproof bags before igniting as this stops any rising damp plus of course any rain, obviously remove the bag before lighting the firework. Also please take notes of the following few points.