So the real question is how do you become aware, and that's where your faith + Holy Spirit comes in. This is very simple because everything in the kingdom of heaven is simple. You set aside some quality time with God. I have a much easier time being spiritually aware in the evenings so that's our time. From the get-go, you need to pray something to the effect of pleading the blood of Jesus over your spiritual eyes, ears and imagination. Ask to be cleansed of the defilement of the day and confess any known sins. Then you just trust that whatever you get will be from God because you took care of your junk up front. You need to do this each time because you want to be a clean vessel for God to work with. Just in the course of a day you get dirty. You'll see something on TV that's violent or you'll hear a dirty joke and that's as little as it takes. I'm not saying you live a sinful life, it's no different than taking your daily shower.
There was a time when I was soaking, and I had a vision that I knew was not from God and I said "Lord, what am I doing looking at that?" Instantly Jesus appeared and I pulled my eyeballs out (this was all in the spirit of course) and I tossed 'em over. He gave them the old spit-and-polish with His sleeve and tossed them back. I caught them and stuck them back in my head and had no further problems. At the time I was pretty amused and the being able to see with my eyeballs out of my head was not lost on me, but now scriptures are coming to mind as I write this. "And if thine eye offend thee, pluck it out: it is better for thee to enter into the kingdom of God with one eye, than having two eyes to be cast into hell fire:" (Mark 9:27) "And he took the blind man by the hand, and led him out of the town; and when he had spit on his eyes, and put his hands upon him, he asked him if he saw ought." (Mark 8:23)
So from there, you just imagine Jesus there with you, and at this point it's all you making it up. That's ok, it's giving you something right to focus on so your brain is not running off track. You just visualize Jesus. Start talking to Him. Some of us are not used to using our imaginations so you'll be able to see that you have to work at it and that's a good thing, because when the Holy Spirit takes over, you'll notice the difference and you'll know that you're not doing anything. That's when it gets real.
I found you guys a free download by Tyler Johnson, who explains all this better than I can, and at the end he prays for you and walks you into a vision. The sound quality is awful, (probably why it's free) but about 5 minutes in, you'll be so enthralled you won't care. Click here