How hard to swap out leaf springs, really?

[newbe351]

I have a '66 GMC 1/2 ton fleet that I would like to install a set of Early Classic Enterprise lowering leaf springs on the rear. It looks like the front attachment point is enclosed in a bracket that would make it very difficult to get a wrench on the nut. Is this something you can do without taking the bed off?

Also, assuming this is a one man job, what are the pitfalls and any tips to make things go a little easier?

Thanks