Once you have the rear of the arm twisted out towards you showing the bushes you can then use a long bolt with threads all the way along, long enough with at least 7cm each side poking out the bush. Spin a nut up towards the bolt head first before inserting the thread through the bush, this will be used to tighten down on the outer part of the bush.
Using a socket which is just slightly smaller than the alloy hole that the bush is pressed into placed on the the inner part of the thread. Attach a large penny washer to keep the socket straight and a locking nut to hold it all in place. Now using the bolt head on the outside part of the bolt start to loosen, you will need a second spanner on the outer nut to keep it tight and nipped up while performing this and the socket on the other side will start to draw/drift the rubber bush out of the alloy hole .
Grease up the alloy hole and the bush with red rubber grease, swap the threaded bolt/ socket around the opposite direction and repeat the process so the bush pushes in this time.
Repeat the process for the next bush...
Repeat the whole process on the opposite wishbone.
Like I said, a lot easier once the old wishbone bolt has been inserted the opposite way to aid removal in the future without fouling the bolt head against the coil spring and having to remove the strut from the hub.
If this has been done before hand, then you are looking at 45 mins to grease up both upper wishbones and refit the wheels
Note: you may need the wheel arch trims out for better access which are held on by a few screws.
Job done, No squeaks and with regular maintenance, your wishbones will now last as long as the ball joint has no excessive play. 4 to 5 years in some cases