At this point, the engine should be free of all its attachments to the mower except for its mounting. For a typical rotary mower, there will be three large bolts accessible from under the deck. Removing these with the proper socket will allow the engine to be lifted and moved to your workbench. You will probably be surprised at how light it is! I recommend just screwing the bolts back into their threaded holes finger tight. That way they will not get lost and the threads will be protected. Also, Protect the threaded end of the crankshaft with a bit of rag or paper towel fastened with an elastic band.