More confused than ever! Best way to line up a song?

The way I do this is with the "Set Measure/Beat at Now Time" command (Shift+M).  I start by importing the audio track, setting my cursor on a downbeat near the beginning of the song, pressing Shift+M to open the dialog, entering the correct measure and beat, and then clicking OK.  I skip ahead to the next downbeat and do the same thing.  The tempo should now be approximately correct.  I skip ahead to a place where the audio starts to drift out of sync, go through the same process to line them up again, and keep repeating as necessary until I get to the end of the song.

I don't know if this is the best way, but it works for me.  I'd like to hear what other people do.

Thanks, guys. I guess I'll give your suggestions a shot!

Digimidi,
I've wrestled with this a bunch, mainly with people playing live, (or older material before click tracks and programmable drums came into play) since people almost always drift to some degree...and unless there's a tool that will follow the tempo...I don't know of a way other than manually to do this...It's painstaking but can be done as stated above by Silhan...this is how I do it...
 
(I assume you have the original loaded in a track...I put it at the top)
1. I start out by putting a midi high track in. (quarter notes) I play/record 8 or 16 bars (quantize this so it's solid) then copy and    
    paste it so I have about 2 minutes or so (or the length of the song I'm copying)
2. I kinda guess the approximate tempo till I'm close then the search for the exact tempo begins.
3. I play the song and listen (and watch the bar and beat numbers) and try to get as close as I can. I usually only
    play 4 to 8 bars of the original starting at the front. You can almost always get close the tempo using this
    method
4. Once I get the tempo that matches the high hat (I play the song (with the hat) for as long as it stays lined up. 
5. When it starts to drift I stop (remember/write down what bar you're on) then go to Project>Insert series of
    tempos and add the new tempo that the song has drifted to. Repeat this process until you've finished the
    song...
6. Once you do all the series of tempos to and from thing...everything should line up. 
7. I then go back to the first bar of the song and with the high hat only...I then learn and record the midi bass or
    piano aprt...usually a bar at a time or if it's phrased, 4 bars at a time...I personally like to do the bass part first
    as it provides all the roots and feels of the song. 
8. After I'm done with the bass and keyboard part, I then "sorta" finish the drums (again 1 bar at a time then copy
    and paste. I re-do the hight hat since I don't need it for click track purposes anymore, then all the fills etc
    last...Once I get the "basic" drums, I finish the rest of the song...snare, fills, cymbles, etc
9. ****This happens to me...Don't know about anyone else but my first bar is always a tad faster on the first beat
    so I always leave that blank and start everything on bar 2...it seems to help me when I start from 00:00:00
 
I don't always, in fact hardly ever, sweat the small stuff like a slight drift...it just happens with human beans.
Even if it (tempo) drifts you can still sequence the tune and unless it's part of the song where it starts off one tempo and "on purpose" gets faster/slower...no one will notice the slight movement. 
 
Good luck
Jason216
post #19 lol

Thanks so much, folks. Every bit of information given here will be attempted until I get it!