Of course, you won't be able to use both the iron sights and the scope simultaneously, so I'm guessing you'll want to sight in your iron sights, then mount your scope, and then sight in the scope.
It's a .22 semi-auto which makes it a little difficult to "eyeball" as far as bore sighting. However, ammo expense is not a factor here, so rather than buying an expensive laser bore sighter, I'd go with critter's and Mal's recommendations and just start shooting at short distances (maybe 15-25 yards) and get the gun shooting to point of aim. Then you can increase the distance out further (40-50 yards) and make any adjustments that are necessary. Or move it on out to 100 yards and do the same. This method will work for both the iron sights and the scope, though the scope might be a little more difficult to get on paper at first.
With a .22, recoil is not much of a factor, but you still would be better off with two sandbags so that you can secure both ends of the rifle and be sure of POA when you pull the trigger. Sand bags are pretty easy to make, and I have one large homemade one that I use a lot. I also have a set of leather Protektor bags that are well made and durable. You could also look into an even nicer shooting rest if you want to spend some $$$. To save some cash here, you might look on eBay.