Hanging a door - need help cutting wedges

Hi guys - I need some help !! I am hanging a new door in a walk in robe that had to be pulled out due to water damage. I have it all framed up and the door jambs cut with clearances etc. I just need the trade secret to cutting wedges to wedge out the jamb from the studs if you know what I mean ? I had a go today on the slide saw but it felt pretty dangerous. Just hoping there is some quick and easy way trades cut these wedges when setting up door frames.

Cheers guys !


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