If you don't want to spend any money, record, say, 30 sec of silence before your song is to start on the session. Then put some sort of marker, like a drum hit, where the song will begin, and make sure your monitor is in sight from your booth. Since you'll be looking, rather than listening, for the beginning (that is, where the drum hit shows up in Track 1) you can even mute the sound on that track so it doesn't distract you or bleed into something else. Then hit record, head for the booth, and boogie.
Good luck with it. A little ingenuity will get you there.