Sharp utility knife, steel straight edge and heat gun can get good results. For large jobs I have used a table saw with a new carbide-tipped blade to process VCT to size. If the fence sits 90 degrees to the table top with no variation, you can stack a few tiles and cut through them with one pass.

If you attempt this, then be extremely careful; table saw injuries can be serious.

Don't cut it all at once and don't neglect to verify from time to time that what is being cut is exactly what you want and that the settings remain true.

If you are familiar with creating table saw jigs, that could also help you design and build a sled which could make the work easier and safer.

You might be able to use one of those new laminate/flooring saws which slide on rails; only in the case of one of those you would want to cut the product with the good side down.

That's all I got.

thanks for the tip, I will look into the table saw idea.