Don't worry about rear spring stops. I thought the same thing when I had mine really low at the back too. I was expecting to find a cone shaped rubber stop on the beam somewhere that would hit the chassis before coil bind but there's not one. The rear bump stop is associated wirh the dampers. The standard OE dampers have a rubber stop sliding on the damper shaft. When I went to Bilstein B8's they told me not to fit those to the B8 dampers as they had an integral stop. Must admit I was dubious but did what they said and I never bottomed them out anyway. Might be worth a call to be double sure.
Re the fronts yeah the drivers side can be a nightmare till you work out whats happening. Its incredibly dodgy but I actually positioned a rod between the struts spring platform and a jack. If you can hold the strut upward just a smidge to stop the damper trying to extend into the hub while you bang it with a hammer it'll pop out. Don't worry re your steering - nothing will be broken. You just need to set your heights and once that's done go and get the tow alignment which will be out. I know that on a mates Clio that the B14 collars were set ridiculously low like an auto salon car and they needed to be raised a mile to get the wishbones more or less level which is what will get it handling well. It could be a similar situation with yours.