Max deadlift attempt tomorrow

Tomorrow is max deadlift day. Looking forward to it. I usually have one good pull in me so I'm trying to decide what weight to go for. I'm trying to figure in the John effect. When he's in the room, I always seem to lift a little more than usual. May have to have some coffee too. Would like to hit 500lbs before the year is up. Had to use tape to hold the 2 1/2s on the ends last time I tried. Been trying to watch videos of light guys lifting 500lbs. Not for form tips but just to see that its possible. Sometimes(most of the time) the mind is the biggest obstacle in reaching goals.