"make a mountain out of a molehill"
Meaning: make something seem much more important than it really is
Example: Dexter, don't expect to remove all the scratches off the paint of a daily driver. You'll be making a mountain out of a molehill.
Last week's idioms:
had('d) better
if I had my druthers
jump all over (someone)
keep an eye on
lend (someone) a hand