The final light straw color Highlander2 mentioned as what you get from bleaching (and the method he described is the easiest and best for any protein material, which is what hair, fur, and feathers are made of) has minimal effect on the color you get when you then dye over feathers, hair, or fur so bleached. The effect is so minimal, that unless you are trying to get a very pale yellow, orange, pink (so-called powder pink), or blue, you will not notice it at all in the finished dyed product.
Using the Lady Clairol hair lightener and 20 volume peroxide is method is very easy and takes very little time, just remember to wear protective gloves when you do it and rinse the bleached materials well in clear, running water.