Question

بی گدار به آب نزن. اول همه جوانب رو بررسی کن بعد تصمیم بگیر

Answer 1

Hi

Cross the stream where it is the shallowest. First, take into account/consider/reckon with all the aspects/facets then make/reach/take your decision.

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Also:

Do not lay/put yourself on the line = ریسک نکن، بی گدار به آب نزن  

Comments

Nice

+1

Answer 2

Hi

Don't go near water until you learn how to swim...f

http://answers.yahoo.com/question/index?qid=20130506195559AA2N933

also

Never venture out of your depth till you can swim
 

Answer 3

"Look before you leap." You have to consider every thing before you make 

a big decision

Comments

Nice

+1

Answer 4

throw caution to the wind: to take a great risk without worrying about negative or 

unfavorable results.

Comments

I think you meant:

Don't throw caution to the wind.

Good idiom +1

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tnx yes because that is easy and clear so i know he can change and

use it

Answer 5

To jump the gun

Comments

It's a little different.