I would suggest taking your control arms to a good shop with the proper equipment. Pressing them out isn't too big of a deal. However, when you go to press them in, care must be taken to properly support in between the two cqontrol arm bushings so as not to distort the control arms while pressing the bushings in.
The old ones can even be burned out, but I wouldn't recommend it - messy, oily smoke, etc.
On my 66 Chevelle as well as the 69 RS, I took the control arms to a qualified shop and had it done for a few $$$ - not expensive at all.
On a side note, be sure to research / discuss with the shop how the new bushings are going to be pressed in after you've powder coated the control arms. ID area of control arms where the bushings press in need to be kept free of any paint / powder coating. Same is true for the lower ball joint which also presses in. The shop needs to understand what you are doing so that they do not mar up your restored and freshly powder coated control arms when they go to press in the bushings / lower ball joint.
If you go with eurethane bushings, the bushings will come with the sleeves - if you go with rubber, depending on where you get them, you might need the original sleeves, which is why some folks used to burn out the bushings to save the sleeves.
Pics below show the RH control arms from my 69 RS after refinish and new bushing / ball joints. Bushings used were Energy Suspension eurethane. Has worked very well on both of my cars.
