Huh? The headline refers to a post earlier this week, when I gave up on a repair and decided to take my bike to our club mechanic. Sure enough, he did the repair in his driveway in about five minutes. Total cost: $5 for his labor, $3 for a new brake cable. A bargain, I thought.
But guest poster Don Blount is more adventurous than I. He chimes in with his own view on doing your own work.

And I did. I also bought some bar tape.
Well, I had the shifters for about a week. The mechanic said to bring the parts and the bike by his shop and he could install. The only problem was his shop was closed on Sunday and Monday and I literally had no time to get my bike there during the week.
So I decided to take the job on myself.
I measured where the old shifters rested on the handlebars and removed one.
I started the install of its replacement and hit the same roadblock as you on how to remove one of the existing cables. I could not find this step anywhere in the instructions. So I scoured the Internet. It took me a bit but I eventually found instructions on how to remove that blasted cable — a small screw removes a panel and then after that panel is removed the old cable comes out and the new cable can be routed in.
Of course that would not be the only roadblock I encountered.
I discovered the front brake was moving oddly. It was loose. That more than likely explained a grabbing action and squealing I was getting from it. The decision to replace it was easy as it broke in my hand as I removed a fastener. Fortunately, I had an old brake set on hand and used one of those until I could get a replacement.
I have had this new set up of shifters and brakes for a few weeks now. They work fine, although when I get a chance I would like to take it to a bike shop to have my work checked.
A moral to this story would be to review the directions beforehand, decide if you can actually do the job. In my case, I had removed shifters and installed brakes. But I had never changed cables.
Also, take your time as you work and keep in mind that the Internet can be a font of information full of videos and instructions on a number of jobs.
And keep a good bike mechanic on speed dial in case you get in over your head and need a professional to finish the job.