I'm working on the design for a FROZEN cake and want to add an "ice" tiara as the topper.  I bought the mold and figured I'd just grab some isomalt from my local supply.

no such luck. they only carry large quantities.

I've never worked with it and want to start out slow.  (hobby baker)

Anyway, I found that LorrAnn makes a candy kit that consists of a bag of powder.  The recipe on the bag uses the entire thing, but I was hoping to find a recipe to use less.  I'm looking to make a test tiara now, as well as the final and an extra in case of accidents.  

Any advice on working with this stuff?  If I use the whole box, can I reheat and remelt the candy later?  

If all else fails, I can always buy a new box when it comes time to make the cake.  I just don't want to NOT make a practice one and find out the sugar doesn't come out of the mold or that it doesn't look like I want it.

See if this link will help you.

http://www.cakeplay.com/downloads/StepByStepGuideToIsomalt.pdf

I have used isomalt in a marvelous "tiara" mold and dried it standing. It's gorgeous. I got the idea from Montreal confections on YouTube search her and you'll find it. It will be perfect for what you're looking for