I suggest reviewing Eve Survival: Mission Reports for tips on running each mission, also be sure to check the comments at the bottom of each page.
https://eve-survival.org/wikka.php?wakka=MissionReportsEpicArc
And like @Derath_Ellecon posted, I use a bling fit shield boosted T3 Loki Cruiser to run all of the level 4 Epic Arcs, with high skill points and some creative piloting it’s rather easy to complete the arcs without having to warp out / repair.