Easy to do. Remove snap ring and old seal. Install new seal with the proper "face" pointing out towards the wheel. I put a dab of oil on the outer edge of the seal. Tap it in gently with a ball peen hammer to get it started. Then use a flat object and a ball peen hammer to seat it evenly. I think I used an aluminum punch also. The install snap ring. Good idea to grind the angle of the snap ring so it is easier to remove next time in 10 or 15 years. Be sure to re-grease the bearing while you have it out. I think the correct grease is the fiberous grease STA LUBE # SL#!#! Drum Bearing grease. Don't pack the hub full of grease. If there is a grease fitting behind the backing plate for greasing the rear bearing DO NOT USE IT as the grease usually ends up on your brake shoes. It was not one of Henry's better ideas. Your car may not have that fitting. I hung a little copper tag near it saying DO NOT USE THIS GREASE FITTING. Last photo .PS: There is only one snap ring for for the hub. Here's the grease thread.
https://www.fordbarn.com/forum/showt...bearing+grease