It’s happened to me, and I’m sure to lots of other people as well: you apply glue to whatever you’re assembling, fit the pieces together and then try to clamp the whole thing until the glue sets. It’s at that point you find you’re unable to get the clamps around the workpiece, and all the while, the adhesive is hardening…
Here’s my tip: always do a dry run first. Assemble everything – even if it’s only a sub-assembly – using no glue. That done, you should fiddle the clamps to ensure that they’ll do their job when it counts. You might also like to take a picture of the set-up with your cellphone or digital camera so you can double-check when the going gets serious.