Yeah, more info needed. Do you need to replace your U-joints? If its anything more complicated than that, you prob cant do it. No offence, but it needs to be balanced unless its trail only rig.
To get u-joints out, remove the clips where the sides of the + meet the yoke. Needlenose pliers are handy here. Beat the shit out of em if they still dont wanna come. Then, to put new ones back in, reverse the process. A press is nice, but a crappy socket of the right diameter can be used to get the u-joint to line up correctly. Again, the needlenose for the clips.
So you need: