[color=red]Big [size=6]KICK[/size] from PA.[/color]
Recruit, what are you doin' standin' there just looking at my words for?!!!!
I wanna hear those knittin' needle's points clickin' double-time!!!
NOW... HOP TO IT! ... HUT Two, Three, Four!....HUT Two, Three, Four!....HUT Two, Three, Four!.....
I have not personally done a throw....but it doesn't really matter. Anyone (like you) who's worked a rectangle in any size has a fairly good idea of how to tackle this....just keep that in mind...and repeat it to yourself as many times as necessary to convince yourself you can do this.
Also, you were right to walk out on that dingbat who gave you "the brush." She was just looking for really easy money....something she didn't get from you. Afterall, it doesn't take much effort to teach or learn garter.
So Anne, I take it you've only knit single color scarves and not multiple colors? If so, you'll be glad to know, if given a choice, IMHO, the best place to actually start a new color is on the ends, where you can start a new row with new tension (no, not the personal kind).
It sounds like you're going to do a big piece "straight needle style" with those circulars. So it'll be a lot easier to wrestle with as it get's longer and heavier. If I were you, I'd grab a pack of rubber bands, large and strong enough to roll and group the length up as it gets longer. Smaller ones might come in handy to keep those dangling fringe ends in order too....on each end of your work, just group them up with a rubber band every few rows to keep things tidy.
Your biggest challenge is likely going to be working each different texture (and thickness) against each other. But you win again, since every new row is a new opportunity to adjust the tension with the next yarn color (and thickness) selected.
Not sure what it's going to be like working a new yarn and color at the beginning of each row? Grab 5 yarns, knit a small swatch of maybe 20 stitches in each row....get a feel for it before you begin. Work out the kinks in your technique of how to continue knitting each row from the end on in. Once you feel good about what you're doing, THEN hit the project.
Those instructions you have, is that it? No other instructions? If not, are they online somewhere where we all can see them?
What's supposed to happen with the fringe? How are they secured, individually or grouped with other yarn ends every so many rows?
It sounds like you're psyching yourself out, maybe you don't need the LYS, especially if you're only doing garter stitch. Give it a shot. If you have a digital camera....and if you run into questions/problems, take a snap and share it with us here so we can give you better advice. While advice in person is usually preferred, I doubt you'll find better online advice than right here at KH.