Another Q-tip TIP!

A wet Q-tip makes a perfect tool for smoothing out a decal.
Wet the Q-tip by dipping it in water.
Roll the Q-tip from the center working out water and air bubbles from the center to the outside edge. Roll the tip, don't scrub over the decal.

I don't know how I got by in the past without using cotton swabs.
They work well smoothing out fillets where your finger can't reach.
The plastic tubes (on generic store brand swabs) are used on removable Kevlar engine mounts.