Not sure about the "little ears" question.
On a Colt 1911 (SA, too):
The first thing removed for disassembly should be the recoil spring cap/plug. You've got to turn the barrel bushing one way (don't remember if it's left/right to clear the plug and then ease the plug out of the slide from the front.
Then, after the pressure is off (spring is sticking out the front of the slide) line up the slide with the back end of the slide stop and push the slide stop out.
Then pull the slide/barrel/recoil spring/guide of the frame.
Then pull the guide rod/recoil spring out from the back side.
Then rotate the barrel bushing the other way and remove it.
Then remove the barrel.
Reverse all that to put it back together.
I've found it's easier, for me, to have the barrel link pushed forward after I put the recoil spring/guide back in place. Then I keep the slide on it's side and put the frame back in the slide. I look through the slide stop hole as I slowly push the frame/slide back into position. I can see the spring guide push the link rearward as the slide/frame are pushed together and when the hole in the link has been pushed into alignment with the hole in the frame I insert the slide stop.
It can be a little tricky on some 1911's. On some the slide stop will easily fully insert with a smack of your hand. On some it absolutely will not. I've got one that I have to use the tip of my knife blade to push the pin rearward into the (forgot the name of the housing on the left side of the frame that has a pin sticking out on front/back - with a spring inside - that keeps pressure on the safety and the slide stop) in order to get the slide stop to fully insert. It's like the pin is so small it pops too far into the slide stop notch or the notch in the slide stop is too wide. Don't know which but it has always required a knife tip (or very small screw driver blade).
Once I get the slide stop fully inserted through the barrel link and frame I insert the recoil spring cap/plug and turn the barrel bushing into place.
Guns can be like the older cars (are you old enough to have driven carbeurated cars?) My 73 Laguna took one press of the gas pedal before turning the key to start it. If I pressed the gas once and hit the key on the 81 Z28 it was flooded. Both were Chevys, both had 350's, both had Rochester Quadrajets. Both were different when it came to starting in the morning.
As you take it apart/clean/lube it you'll get any little things like that figured out.