If you insist on doing it yourself(?) follow the link to this company. But, as was said above, without the proper tooling you'll do more damage than good?

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Has the pistol been fired by anyone else besides your Wife and yourself? The reason I ask, is because quite often on a new gun folks will tend to push the muzzle downward in anticipation of the shot firing. Before adjusting your sights I'd suggest a third person of a known good quality of shooter fire it off of the bench, to see if his/her shots are landing where both of yours currently are. If not, a sight adjustment wouldn't be indicated.
BTW WELCOME!
And please tell us how you proceed!