Resize A Image Without Losing Quality

I have been reading about how to best resize image in PS CS4/CS5.  I've read that you should increase the size of a image in increments and I’ve also read that you should resize using the bicubic smoother setting in PS.
The image that I would like to resize is 5W x 7H and resolution of 150. I would like to print this image at 30W x 40H on a HP Designjet 5500ps.
Any recommendation on how I should go about resizing the image without losing quality?

No matter which method you used, scaling up a photo 5 times is going to look very good.
There are some software that purports to scale up an image without blurry edges. Not sure how well they work.
If you can obtain the original image and rescan it at a higher resolution that would work better.
Or, if the photo can be easily recreated as a vector drawing, then do that with illustrator and print it out large.
Or if you or someone you know is a great artist, then scale up the photo in photoshop (which would become blurry), then hand correct the edges to make them sharp. This requires drawing ability.

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