sett, especially with ignite, can kill you easily. you dont win lvl 1 if he has ignite. be very careful to not get stunned by his E cause he can one shot you with W
another game, i waited in a lower bush and he went from river so i could run him down and he had no possibility to stun me with his e. he took w, and believe it or not, but he still almost killed me (with no ignite), but i had ignite tp so i could kill him
go barrier, dsword
late game you have to be extra careful not to have your minions around you so he dont stun you
maybe try ksante