Some rules of thumb (green thumb? haha) -
Only go up one pot size when re-potting.
Cover the drainage holes with broken clay pots or I use a coffee filter.
Use a good lightweight potting soil (never soil from your gardens!), and never use soil that comes with fertilizer in it.
Add micorrhiza to the soil and make sure the roots are in contact with it.
Never plant your plants deeper than the pots they start in.
Do not use fertilizer for a few weeks after re-potting.
Use aspirin to help weak or stressed plants.
For the full story and more information, visit my blog. http://dewdropgardens.blogspot.ca/2013/04/how-to-re-pot-tropical-houseplants.html