You'll need a special tool to get the bushing out and another to drive the new one back in. You;ll need to separate the transmission from the engine. It isn't necessary to remove the clutch from the flywheel to get at the bushing. The tool will remove the bushing with a wrench. The tool that us used to install the bushing is driven in with a hammer Mount the new bushing to the tool and tap it in the flywheel with the hammer. Since you didn't take the clutch off it'll be easy to mount the transmission back onto the engine.
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You'll need a special tool to get the bushing out and another to drive the new one back in. You;ll need to separate the transmission from the engine. It isn't necessary to remove the clutch from the flywheel to get at the bushing. The tool will remove the bushing with a wrench. The tool that us used to install the bushing is driven in with a hammer Mount the new bushing to the tool and tap it in the flywheel with the hammer. Since you didn't take the clutch off it'll be easy to mount the transmission back onto the engine.