They are not many, but there are times in which Moses and the Israelites acted within the blessing of God, but without the direct Word of God telling them to do so. The best instance is when Jethro, Moses' father-in-law, advises him to set up judges to proceed over cases between the people and only bring the hard ones to Moses. This is not a direct Word from the Lord, but still Moses follows this bit of wisdom and the concept of judges within Israel emerges as a result.
Too often today, and much more so with my own generation (millennials, gen-y, etc.) we wait and do nothing. With the neo-reformed movement that is sweeping the nation and many of the younger generation of Christians, we are taught that God is sovereign and orchestrates the circumstances of our lives to work within His Will. Though I know, believe and trust this to be true, I do not believe it is the come-all-end-all of decision making. We should not sit and wait fully on God praying, "Lord give me this job" or "God I desire a spouse" or "Father, send me to foreign land to do missions work for You" or any other variation of these prayers.
Instead, we should spend our time getting to know God - His character, will, and desires - and when we are uncertain as to where God is leading (whether from Him be silent on that particular issue or our own lack of being able to discern Him) we must act in accordance with everything we currently know about God. The prayer, "Lord give me this job" should rather be "Lord, place me where You will" and then while we are waiting on that continue to work and search for that exact place. Apply for positions that may be an answer to that prayer, go to interviews and trust that if it is not the right place for you that God will let you know that in His divine time.
This means that we will make mistakes and we will suffer setbacks in finding God's will for our lives. But I am a firm believer that God rewards us for the effort we put into getting to know Him and following His will. As long as we are doing that there is no true wrong answer, though there are plenty of answers that are not right.