For most felt stuffie pieces, you use pattern pieces and trace them onto the felt.  But for small details, that won't work.  Felt is bumpy and fuzzy and any outlines you trace are imprecise.  That just won't do when you're making circular eyes or curvy nose detailing.

For small shapes, I will lay the felt next to the shape to see where I should cut.

After I cut the felt to the right height, I lay it next to the shape to see what the width should be.

If I need two, I cut them at the same time to be sure they are the same shape.

Then carefully, with small sharp scissors, I start cutting bits away from my rectangle.  I use manicure scissors with curved blades - they are perfect for small felt shapes!

I keep cutting away bits.  Just a little at a time.  This takes patience and a steady hand.  And, of course, if I totally jack it up, it's no big deal!  It's a tiny bit of felt, I just start again. :)

Here are my final nose curve pieces.  Ta da!

This can be used for any shape, just start with the bounding rectangle and snip away until your shape is revealed.  For circles, start with a square and trim away little curves at the corners - it works like a charm!

**Edit**  Anne posted this link in the comments, but I don't want you to miss this amazing tutorial How To Cut Out Felt - REVISED from Wee Folk Art which shows you how to use a paper pattern piece and packing tape to cut out tiny shapes.