hi- I've done this task several time. The best is to use a bucket that fits unser the lower hose connection. Leave it there for a few hours if you can. When you flush the system use good clean water- the trouble with hose water is that the minerals attach to the metal in the block and radiator so use filtered water if possible.
I kept the water in the engine for a while as I drove around town. It cleanses the acid residue from the flush out of the block.
Place the used anti-freeze in the original container if U still have it- otherwise in one or two of the bottled water containers.
You will need about 7 liters of antifreeze 50/50 using distilled water. My experience with some anti-freeze compounds is that they go "sour" after a while and algae starts to build up in the system. so use a good antifreeze compound.
This is good info:http://www.matthewsvolvosite.com/anti-freeze-brand.html
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89-740 GLE;91-940 Sedan ;98-V90 Wagon ___ all running well