Cook the shells just until al dente: They'll continue cooking in the oven, and firmer shells are much easier to stuff without tearing.
Cook a few extra shells: Jumbo shells occasionally split while boiling or filling, so having a couple of extras gives you some backup.
Let the beef cool slightly: Don't mix piping-hot beef straight into the ricotta and egg mixture. Give it a few minutes to cool first.
Shred your own cheese: Freshly shredded mozzarella and provolone melt more smoothly than packaged shredded cheese.
Don't skip the covered baking time: I like that these bake covered first because the shells stay saucy while everything heats through. Removing the foil for the final 10 minutes gives the cheese time to melt and start browning.
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