Pssst pussy.
Whack the old middle sections out, usually they fall apart. Inside is two sleeves. Knock the inner one out by getting a chissle in the smaller edge. Hard to explain but it's about 8mm thick then just ram a bar through it and it will slide out.
Then comes the harder part which is the outer sleeve. Get a small chisle and ram it in between flat, it's tough but keep going and going. Then just get a sharp chisle and use it to cut it.
Done a few now and it takes about an hour a side. An installation tool is easier, threaded bar, a plate and a 65mm socket is my choice and works better than a bought one.
Clean up before installing new and use fairly liquid. Impact tool makes easy work of installing with a tool, to wind it up.
Lemforder one's fit easiest and will probably last the longest.
Goes without saying but line them up properly and don't tighten them until car is level.