Yep, the sight blade is pinned in. The pin must be carefully tapped out with an appropriate sized pin punch. These are usually just pinned in and not also soldered etc. But there's no way to know for sure on your particular revolver.
A couple of other caveats:
1) The pin may deform in the process and a new one MAY be needed to reinstall the new blade;
2) Be very careful not to mar the barrel finish -- the pins are often very difficult to see; and
3) Chances are good that the new pin will never look as smooth as the factory job, as it certainly appears that the pin is installed at the factory and then the entire revolver finished and polished.