Maybe I got lucky, or maybe they just made them differently when I bought them (late 80's early 90's), but most of my Dansco albums are loose. Most of my coins, including proofs, just dropped in. Actually, I often have the problem that my coins spin around over time!
Back to question at hand...
My two albums that are tight are the
Roosevelt dime and
Statehood Quarter albums. I am able to get them in by dropping one edge in first, then applying light pressure on the opposite edge using a soft cotton towel or the 2x2 method mentioned by Metlman (assuming the coin came in a 2x2, of course!)
They are not really that tight, more snug, nothing like the Whitman folders! They took little pressure to coax them in. Just be careful, take your time not to let the cloth or mylar slide (and possibly scratch) the coin. Patience is a good thing!
I think the advice of "sizing" the hole with a "throw away" coin would maximize success.