Checking like paranoid is there any mistake in bitcoin address, no one wants to lose 10BTC.
I must say that this one is probably my greatest fear about using bitcoin. Copy/paste a few times just in case and then checking it once again just in case. But other than that, variability in confirmation time could be the one, besides those two things, nothing specially.
I must said this is one of of my greatest fear which is sending my money to a wrong address because missed one letter then it will be disaster and it is not reversible and also the confirmation time sometimes took so long, until i wonder will my coin arrived safely , because once it was sent i can't cancel it, and if something is wrong then the coin will be gone