Basically, have a pretty good idea of how much damage you can do as well as how much you can take. Watch the map for people that are overextended, try not to go through obvious wards. And this is the one that even I still have to work on... ping your target or say on mumble or something so that lane knows what you are doing and they can try to get a stun/slow or something to make it easier or at least come help at the right time.
Adding that last point... everyone, I mean EVERYONE needs to watch the map for when a ganker is near and be ready to assist or whatever (without dying of course). Too many times I'll sit in a bush for 5-10 seconds before going in, go in and have whoever else was in that lane going the opposite direction causing me to either die or have to blow flash. But, I also share the blame for that because half the time I don't ping or anything before I go in. But when I do and that lane runs away... oh man.
Adding that last point... everyone, I mean EVERYONE needs to watch the map for when a ganker is near and be ready to assist or whatever (without dying of course). Too many times I'll sit in a bush for 5-10 seconds before going in, go in and have whoever else was in that lane going the opposite direction causing me to either die or have to blow flash. But, I also share the blame for that because half the time I don't ping or anything before I go in. But when I do and that lane runs away... oh man.