Use care while installing the seal to be sure it stays straight and you will be golden. That will prevent the lip from curling over. Put the sleeve on the crank, grease it up and push the seal off the sleeve and onto the crank. Most new seals come with a thin plastic sleeve inside that fits over the end of the crank. If you have a brain then you can do it without the tools. The special tools just make that a no-brainer. Get those two right and the seal will be fine. The two things you have to watch out for when installing a rear main seal is that it remains square with the back of the engine while going in and that the lip doesn't get curled back enough to allow the spring to come off as it passes over the end of the crank. You can get a repair sleeve and seal or if it isn't too bad you can polish out the flaw with crocus cloth strips you can get at Harbor Freight. If you happen to damage the crank it isn't the end of the world. Even a small scratch on the crank will ruin a new seal in no time. Use an old screw driver that is dull and has no dings in the edge so it won't scratch the crank where the seal has to sit. To remove the old seal just push a screw driver between the crank and seal lip and pry. In that case it makes no difference if you damage the seal, just don't hurt the crank or case. Normally, you take out the old seal to put in a new one. I don't know why you would take out a seal and then reuse it but it could be done. The special tool to remove the old seal will usually take it out without damage so that it could be reused.
For us mere mortals it makes more sense to make do with lesser tools.
I have been repairing a wide variety of vehicles for all of my life and after 50+ years of drooling over special tools I have come to the conclusion that they are primarily for factory use where a $1000 tool can make sense if it saves 10 minutes on 50 assemblies a day. Ebay has some used ones but they aren't much cheaper than new. OTC has the installer tool for a little less than $300. You could maybe buy one from the dealer but be prepared for sticker shock and a long wait. They won't loan them to you though because they cost a fortune and if you don't bring it back they will have to buy another. The only possible source would be to borrow it from a dealer, who is required to have them to keep his franchise. Nobody, and I mean nobody, has all of the special tools the manufacturers call out.
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