I've done several of these oil line replacements using the 1124-007-1010 kit. The business about drilling a pair o' pliers to get the hose over the pump barb is insane. So is the modified screwdriver deal for inserting the brass trumpet piece into the end of the line.
And I've done these from both ends. Sort of a toss up, but I think it's easiest to get the trumpet end squared away first using a little heat. Then use a punch to tap the trumpet end into the case channel, even enlarging the channel slightly with a drill bit to make it a little easier if you like. The pump end is where the real fun starts and the only way to do it easily is with a heat gun. Heat the hose a little but heat the pump a lot. The hose will flat out melt if you get it too hot by itself but will get pliable enough to slide over the barb fairly easily with just a little heat if the barb is also heated up pretty good.
All that stated, I just did one a week or so ago using a brand new OEM line kit and it was a disaster due to the line being even more super ridgid than any I've gotten before. It just melted into an unusable mess from the initial blast of the heat gun like heat shrink. Didn't even attempt a second shot at it with the remaining piece of line. Happened to have an old piece of impulse line handy that was much more cooperative and used a roll pin for the insert at the delivery end. Took all of five minutes. Should have just gone that route in the first place! The internal spring is a must for the bend just before the pump barb for the ridgid line or it will most likely kink otherwise. Using a more flexible line like the Stihl R3 impulse hose shouldn't need it. And if the line is cut to the correct length you can get it on the pump barb with the pump not yet in the installed position. It'll just barely make it over the crank after the line is in place unless the line is too short.
Who needs a video for this, anyway? LOL
Happy cussing!