it can be done that way, but be careful not to cut into the control arm... the method i used was a cutting tourch and scarfing the old sleeve out... the sleeve metal is made from a different material/metal than the control arm, and thus it burned out much easier and with minimal risk of damage to the actual control arm itself.
to make things easier on yourself, get some sylglide for lube -poly bushings will squeak if dry, and the sylglide will help with instal. heat up the control arm assembly in a oven if you can(make sure its clean and free of gunk ect -i took mine and washed them out in a parts cleaner and used a wire brush on them, then painted them with epoxy paint to fight rust and make them look nice and new, and the heat from the oven helped bake and cure the paint as well) as this will ever so slightly expand the metal -like 250* or less is all that is needed, and then freeze the bushings(this will shrink them) the combination of the two extremes will help you install them without the use of a press. remove the frozen bushings, apply sylglide to them liberally and put the control arms in a vice then use a 3lb hammer and something with a smooth flat surface to lay over the bushing and proceed to tap the bushing into place... -repeat as necessary. the two temp extremes will quickly offset one another and within about 10min they should be able to be handled.
