I assume you want to change the top blade at the end of the arm. If so just get yourself a split ring separator and this will aid in separating the split ring, so you can take off the blade. That is providing the ball bearing on the top blade is still usable. If not replace the ball bearing as well. If you are trying to remove blades on the spinnerbait wireform arm that sit in a clevis, well I have bad news for you. That is going to be near impossible, as the wireform is looped at the end of the arm so the top bearing and blade can be attached. The reason being is you need the get the clevis, arm blade and any beads off the wire to change it out. However, you will need to straighten the the loop at the top to do this. Problem is by opening up the loop at the top, you will never get it perfectly straight to allow the clevis and beads to slip off the wire. Also you have a chance of weakening the wire at the top, because if you do get it to open, you will have to bend it down again to close it and you may just end up breaking the loop.
You can do this. If you don't mind a shorter arm on your spinnerbait, cut the arm as close to the loop as possible, take off all the hardware you want to replace, and then reform your loop at the top to accommodate your bearing and top blade. This may change your spinnerbait action.
If you are looking for components like blades and clevices and bearings, beads, check out LPO and Barlows. They have a ton of components that you can buy and swap out. Just make sure when you buy beads and clevices, that they fit on your wireform.