go out on a limb

'Are You Smart Enough to Work at Google'からの引用です。

1. Go to floor N and drop the first egg.
How do I know the algorithm begins this way? Well, I'm not going out on much of a limb. An algorithim is a list of idotproof instructions, starting with instrution 1. It tells you to drop an egg, naturally, because that's the modus operandi here.
"going out on much of a limb" の個所の意味がよく分からないので辞書で調べます。
・Wikitionary: To take a risk.: He doesn't want to go out on a limb, but he really should give it a try.

・Collins COBUILD Idioms Dictionary: If you go out on a limb, you do something or say something that is different from what most people do or say and is therefore risky. He does not want to go out on a limb and try something completely new. There's nothing wrong with politicians going out on a limb sometimes and risking their reputation.

"go out on a limb" の語源についてはPhrase Finderに次の説明がありました。（抜粋）
The limb being talked about here is the branch of a tree and 'out on a limb' is an allusion to climbing trees and going just a bit further than is comfortable.
調べている内に思い出しました。5/26/2015 に "out on a limb" を既に調べた事を。