Air flow meter removal

Guys. Need to understand how to remove the above on a 1999 micra. Have the throttle body off the car. Unscrewed the connector. The 2 screws at the bottom of the tb are stubborn little gits. Any advice would be appreciated.
 
Frank, thanks very much,you saved me time there! Any suggestions as to where I can purchase a fully working tb? Better buying new maybe. Euro car parts are doing one for £160 ish I think.
 
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