Down converting HD to help workflow

Hi All
I have been given many quicktime animation files to cut into a sequence in Final Cut Pro 6. The only problem is that they are 1920 x 1280 in size and are in Blackmagic 8 bit!!!! My computer cant handle the files, they are huge.
What steps should i now take to get them into a workable file type to edit with easily, and how would I go about when finished editing the piece, getting the online back to the original 1920 x1280 qt files provided originally. The files are also animations at 24fps.
Someone has suggested converting the original QT's from black magic to photo Jpeg using quicktime pro or compressor?
Much thanks to anyone who responds!!!

Hi Andy
Thanks so much for your response, media manager eh? Ive never used that before. Ive been looking for tutorials on the net but no luck. I did a test by high lighting a clip in my bin, chose Media Manager. Then I selected Ofline and chose the file to be photo Jpeg offline HD 24 fps, then when i clicked ok it asked me to save a new project? then when i save the clip is sitting there in a new projact, but its still uncompressed 1828 x 988? I would have assumed it would down convert it to the photo jpeg codec? and when i play it on the timeline it looks really pixilated... ha
am I completly missing the point of Media Manager?
Like I said, I have no idea about it - I come from Avid

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Down converting HD to help workflow

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