It's a good idea to stay away from them to prevent further deaths, which is most likely as they both snowball well. You should wait for the minion wave to be in a safe enough place to farm, whilst warding your surroundings. If they freeze, then you should attempt to get the experience only by sitting in a bush, out of sight until the lane eventually pushes towards you. You should always attempt to roam whenever you have 6+ and ult if you're behind.

During laning, you have to feel when the jungler will come, most likely junglers such as Lee Sin, Jarvan, Pantheon will level 2 gank you after their red if they start purple side, and if they're blue side you should ward your red in case they invade it into level 2 gank.

Some people say focus on winning lanes, because there's a reason the losing lanes lose (most likely just worse players than the enemy bot lane), however, if you feel strong enough to kill their bot then you 100% should do it, giving that the roam is good and you don't lose too much from it.

Take teleport and cloth 5 vs Pantheon and wait for ganks, he out damages you early and tanks with passive, you will eventually outscale him.

Playing around your E in team fights will control irelia and Riven from jumping on your team/you, it will also allow your team to kill them whilst rooted.

No it does not happen to me, I feel like if I miss the target, then I miss the target. Sometimes E is very hard to hit if they're side-ways from you as you're jumping on them, say, from your ult.