I have a TIF image created from a flattened PSD file.  It is presently sized to 20"x 20" image size, resolution is 300 and pixels are 6000 x 6000.  I sized it this big so when I take it to the printer, he won't have to resize (I want it 20 x 20).  

However, the file is huge (210 mgs). What can I do to make the file size smaller so I can save it and bring it to him?  Will I lose image quality if I save it as a jpg at the same resolution?  I thought I could do that but not sure how much quality would be lost. Thanks.