Frances,
Having the skill to create high pressure metal lines is worth the time you will have to invest learning this.
50 year old German stuff will make the learning process a bit harder.
These cars use bubble flares which is less common than normal angle flares/double flare.
To do this job well you need a pretty good flare kit.
https://www.amazon.com/MASTERCOOL-72485-PRC...mp;gad_source=1https://www.eastwood.com/eastwood-hydraulic...google&wv=4Both of those kits would last you a lifetime.
You can find cheaper stuff but at some point the quality level of the tool affect the quality level of the flare.
Super cheap is NOT the way to go here.
stainless is NOT the preferred material. Copper/Nickle IS the hot ticket for strength, ease of fabrication, and corrosion resistance.
Hydraulic versions of the flaring tools are 1000% easier to get professional results with but manual tools can create decent results.
Now, brake lines come with BIG ASS built in liabilities...
You make a brake line that fails and causes injury to others you CAN be held liable!
Even doing it for yourself creates liabilities if you crash into someone else.
My advice is "if you do it for yourself DO NOT document it or POST anything about it on open forums."
Buy the lines, keep the receipt...
"Having" the ability does NOT mean you should "apply" it sometimes.
If you want the ability, get a cheap manual flaring kit and some of the copper nickel line and play around with it.
Your 10th flare will be a vast improvement over the first one you do.