Steering questions need answered

My upper and lower ball joints need replaced badly on my 1994 GMC Yukon and the mechanic told me my pitman and my idler arm are both bad. My problem is I can only afford to fix just the joints or just the arms first. I really need to get back on the road so which should I repair and is this not safe to drive until all is fixed? Another question, do I need special tools that only shops have to fix any of this myself? Thank you!