Anyway, make sure you always have somewhere to go in the event something goes wrong,
try to slot in the traffic,
Just cause the lights have gone green, doesn't mean that all the car drivers react in one smooth motion like they should. They only look as far as the person in front, and it is about a second before they notice the other person in front move off. Whereas, we have been watching the lights, and are prepared to set off in line with the person at the front, in one smooth manner, wishing all the traffic would accelerate uniformly recognising when the lights will change.
And always prepare for the tosser who brake tests you, The people who change lane on you, the list is endless.
The traffic will (Hopefully) form a nice linear (ish) queue at the lights.
They won't be expecting someone to plunge themselves straight into a gap by their side.
Once lights change, you have 2 choices. Outrun the person next to you (can be a challenge on 125's and 50's) or move in behind them.
DON'T filter at twice the speed of light.
Don't filter anymore than 20 miles an hour above the traffics pace.
Don't try and keep up with Couriers, Pizza Delivery scooters, Blood Runners, etc. It will end in tears, and embarassment. (Superbike being outrun by a 50)
and, Number 1,
IF IN DOUBT, DON'T.