Are you trying to take the whole steering knuckle off and the axle ??? If you want to do both you need a bigger compressor (for axlenut) and a ball joint tool separator. First off:

1. loosen the lugs and take the wheel off

2. take all the cotter pins off the ball joints, and tie rod joint. (don't lose the cotter pins or you'll end up buying new one, or use paper clip/wire)

3. release the small lock on the axle nut with a flat head screw driver, and use impact gun with the correct axle socket to take off the nut.

4. loosen all the nuts on the ball joints, and tie rod. (there should be 3 nuts: the one on top of the knuckle, bottom knuckle under brake disc, and the tie rod) NOTICE I DID NOT SAY TAKE OFF ALL THE NUTs YET, ONLY LOOSEN THEM.

(Now for this step you'll need a trusty friend or ask your dad/ or brother to assist you.)

5. Take the nut off the tie rod joint, and using the ball joint separator tool pop off the tie rod. Shouldn't take you no more than a minute.(you can get this tool at AutoZone for under $20 to rent or keep)

6. Next do the same for the bottom ball joint under the brake disc.

7. Then do the ball joint on the top and ask you friend/dad/brother to hold the steering knuckle as it pops off.

8. Now that everything is off the knuckle, leaving you the axle still in place of the hub/knuckle.

9. Use a hammer to hit the axle off as your assistant is holding and pulling the knuckle. (Dont hit on the side of the axle, you'll dent the threads, hit it on the flat surface straight out.) The knuckle should just slide off.

10. Now you are left with the axle in place with the transmission. Use rope to hang the axle or if you plan on poppin out the axle, use a pry bar or large flat head screw driver. Stick it in between the the axle and transmission and use your strength to pry out. Sometimes it will take a good amount of force.

11. On the other hand, now you got the steering knuckle out, and do what you gotta do with it.

To stick the axle back in the transmission, just place it back in and play around till it fits snug half way. It will not go in completely, so use a RUBBER MALLET (NOT a hammer) and tap the axle back into place.

I hope this helps. iIf not then, I guess you might need to seek a mechanic...good luck man.