The will of God for you particularly (as opposed to his general will for all people to know, love, and serve him in this life so that we can spend eternity with him in the next) can be difficult to distinguish. I have known a couple times in my life for sure that God was asking me to do something.
The first time was when some friends tried to set me up with my now wife. I hadn't met her yet and was commissioning into the Army and headed to Ranger School, the 82nd, and then Iraq. I had never really seen myself settling down in the future, my plans were after doing some high speed stuff in the Army to go back to my family's ranch in NE and play cowboy. However when my friend mentioned her name I clearly heard a voice tell me, "this is what I have for you, you're going to marry her." I did my best to pull a Jonah and avoid meeting her, and even after meeting and beginning to fall in love did my best to avoid what I knew was inevitable, and best for me, but finally decided to obey while laying in the prone "pulling security" on top of a cold North Georgia mountain in December. Following, surrendering to that voice has completely altered the trajectory of my planned life, but it has been for my good.
The second time, after returning from Iraq, my brigade was immediately put on the global response force, 6 months earlier than scheduled because 2nd Brigade was sent to Haiti after the earth quakes. I found myself working 16 hour days frequently as we tried to reset as quickly as possible and train up for an entirely different mission set then we had done in Iraq. My wife and I were married about 6 months before my deployment, and we quickly realized the next 18 months on two hour recall to Fort Bragg, were going to be very tough on our young marriage. (There wasn't a lot for my recent college graduate wife to do in Fayetteville, NC) that's when an opportunity to go to the Old Guard came along. I didn't join the Army to march and play dress up, but I knew immediately this was God's opportunity for us. I put in for it and was accepted, however my brigade commander denied the transfer. We were sort of devastated as we clearly thought going to DC was God's will for us. Over the next few days we came to grip with staying at Fort Bragg, somewhat bitterly at first. After we sat and prayed together "not my will but thy will be done" the very next morning my battalion commander found me after PT and gave me word that I was getting sent to The Old Guard despite their wishes to keep me. Apparently the day before my brigade commander had been at human resource command when it's cg cornered him and told him something to the effect of, "I hear you don't support the Army's mission to honor its fallen heroes, that couldn't be true could it?" So he released me, and it turned out to be a great gift to both my wife and I, apparently divinely ordained but only when I surrendered my will.
Given all of that there are a few signposts I find very helpful in determining the specific will of God:
1. Scripture (or in your case church teaching), does it directly say anything, or have principles that apply to this situation. Like for example marriage is a good gift that God gives some of us.
2. Open doors, if God truly wills something for you, he will (eventually) make a way.
3. Personal impressions while deep in prayer. Often the Holy Spirit may speak to us in a still small voice while we are communing with God.
4. Surrendered desire, when we truly come to a place where we seek God's will above our own will, if we still really feel something is the right move it likely may be.
5. Advice of other faithful individuals who both know and love you and know and love God. God often chooses to speak to us through our fellow Christians, just be sure they know and love both you and the lord.
No one of these is a guarantee, but taken together they can give you a pretty good idea what God's will for you is. Often however I think God leaves it to us to make the wisest choice possible with the information available following his principles (like love your neighbor, provide for your family etc...), and I've found sometimes when he does ask you to do something, you just know (typically because it's something you don't want to do but feel an overwhelming sense you must).
Hopefully this long post is helpful, good luck discerning his voice and will. Thoughts?