Just to clarify: when I candled snake eggs, I seldom picked them up...so less chance of dropping them. I just opened the plastic & candled them
in place, as "planted" in moist vermiculite, then re-covered them. The biggest reason to re-candle them is if they started to develop mold or funny
colors...they still might be good, but you want to know & toss them if they aren't, so the mold doesn't spread & a rotten egg doesn't attract flies.

Besides the chance of slipping & dropping one, another reason not to handle them is that you might get distracted & mess up their orientation...
they must not be turned.

I certainly 'second' what paulh said: whether you're waiting for to eggs to hatch, trying to get a fussy snake to feed on a different color rodent, or waiting
while they insist on eating it backwards or sideways, we herpers DO need "glacial patience".