These are some of the things that I learned or found helpful when working with miniatures:
Very important: Choose high (color) contrast, small print fabrics
1. Pre-wash fabric
2. Press carefully, starching 2-3 times
3. 60/2 or Bottom Line thread
4. Paper-piece if you can - if not pin well
5. Use leaders and enders - single hole plate if possible.
6. Very accurate 1/4" seams
7. Use tweezers to pick up and guide your pieces under the needle (your feed-dogs may not like something that small)
8. Iron seams open (reduces bulk)and then cut down to 1/8"
9. Measure, measure, measure blocks as you go - but finger press - try not to iron as you go because it is really easy to distort such small block pieces.
10. Use thin batting or flannel
If you find you need to unsew a piece, be gentle those little pieces distort easiely - sometimes it is faster and better to recut and do a new piece.
Binding - mini's only need single fold binding (not really any wear and tear on those little guys) and cut your binding so that you end up with a narrower binding than normal in order to keep it in proportion to the size of the mini.
Have fun! Share your pattern if you can and you'll probably get even more suggestions or helpful hints.