This might be the idiom to use if you really wanted to retain the ice idea. It is used a lot in sport.
You'll also need a sound allocation plan, a disciplined mind-set and maybe some ice in your veins to keep your nerves calm during the inevitable jumpy market periods.
http://www.kiplinger.com/magazine/archives/2007/06/plan.htmlRoget's Super Thesaurus
unafraid a. fearless, brave, courageous, bold, *having nerves of steel, *having ice water in one's veins, dauntless, unflinching, *gutsy, *ballsy.
http://books.google.co.uk/books?id=iomYFplmNmMC&pg=PA630&lpg...A pacey and offensive player, the young left-back has worked arduously since landing in Madrid hoping to capitalize on the opportunities given to him by the manager. With nerves of steel and ice running through his veins, Marcelo didn't take long to earn a spot in the starting eleven.
http://www.realmadrid.com/cs/Satellite/en/1193041476158/1193...