You can lift the engine a bit and pull it or cut out the cross member and install a removable one. I simply do not like working up-side-down on an engine. On a dirty car contamination is possible but making sure the gasket, seals and corner goop doesn't slide as you putting in the bolts can be difficult with only one person.
I install long allen set screws in every other 2 holes to keep the gaskets aligned and help position the pan while the bolts are being installed. Then remove the set screws and replace them with pan bolts---makes it easer to keep everything straight.
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