Do not get intimidated about removing the Side Plate. It is easy and not a big deal to do. DO NOT pry it off! Hit the grip Frame with a wooden hammer handle if you do not have a rubber or plastic mallet, it will just pop off.
That's close enough for government work, but a little refinement might help:
Let's try this: Instead of "hit", let's say "tap"---more than once----tap-tap-tap. If nothing's happening, like you can't see the sideplate moving away from the frame a little bit, then TAP-TAP-TAP!!!
Next, yes it will "just pop off", but best it pops off under control----like so: Hold the gun, sideplate UP with your holding hand-----and tap-tap-tap with your tapping hand. Then, when it pops off, it'll be between the gun and your holding hand----instead of heading for the floor. Then you can lift it off, instead of hoping it doesn't get dinged when it hits whatever's down by your feet.
The next little problem is the hammer block in later guns (post-war): It's a loose piece, which is to say it isn't held in place by anything besides the sideplate; so when the sideplate pops off, it's free to go flying across the room and land underneath some very heavy, essentially unmovable object---just to make your life interesting. The gun will work fine without it, but it's there for a pretty good reason. You'll get the hang of putting it back where it belongs when the sideplate won't go back in place unless you do.
I reckon there's more than a few videos on the how-to on You Tube, so have a look at one. It'll make your life easier than mine was---way back when there was no You Tube, no internet, and no nothing else except for the realization the gun ain't going back together until you get it right. The good news is, if you do getting the sideplate off right (gently), the hammer block will still be sitting where it belongs---and where it needs to be put back----without any video.
Ralph Tremaine