Assuming it's not a walk-out basement get the stair-climber moving dolly and a few friends...
FWIW, I moved my cheapo (ammo safe) Sentry that weighs about 400 lbs by myself into my walk-out basement. I had them lay it down on it's back on card-board when they put it in the truck. I took the tailgate off, laid card-board over the bumper, slid it out to the balance point and carefully tippied it down then let it slowly slide to ground level by balancing it. Then I "walked" it into the basement, right through the door and into the room where it sits now.
I realize that it gets much harder as you go up in weight, but don't underestimate your ability to move something just by thinking it through.