Get some kind of object to jam the trem so it's flush with the body or slightly raised, I used a pencil or the backplate from my guitar, it worked (these are LFRs, not Edge's)
Doing that, put the strings on, then tune it up to standard, if it's the right tension, then pulling it slightly sharp from standard will allow the object (pencil, backplate, whatever) to slide away, then you can make your slight adjustments. Gets you 90% of the way there safely.