Take this for what it is worth but I was a long time dog groomer and used all of these blades at one point or another. A 3/4, 5/8, 4, 5, 7, etc. is not going to work well on a calf that has the woolly fuzzy hair because those blades are designed to get against the skin and clip, if you try to free hand or block with them it will be a disaster. Those blades will only work on one that has straight hair.
The blending blades (medium) are a better option because you can lay them flat against the skin (i.e. for the head and brisket) or turn them over and use it like a rake to blend. The best thing to do is to get the blades and play on one that you aren't showing so you don't screw it up. I never use the x-block blade on anything but legs because that thing will skin one in a hurry and will slice you to the bone if you aren't careful yourself, and trust me the end of your thumb with a clean cut just doesn't stop bleeding. Our show box looked like I had castrated calves in it while I was trying to find a paper towel to staunch the flow! :-\