The leafs can be a real pain in the @$$. On any leafs that are, Use an angle grinder and cut the leaf eye in two places. Pull the leaf metal off. Pry off the rubber bushing (crow bar, it will split and break off), use a dremel to cut the inner sleeve. Grab sleeve with locking pliers and unscrew bolt.
If the fronts bolts are bad, just cut the bolts and hammer out (big hammer).
Installing the front axle can be a pain. Check where arms contact axle brackets, grind for more clearance but don't weaken the brackets. Assemble without springs, drop as low as you can and put springs in. Hook up shocks and put calipers on last.
Put everytihng on with anti-seize. Use plenty!! 2 years from now when you've popped a bushing, broken something etc. It will come out with ease!!
Lastly, plan for a lot of hours. It takes much more time to pull the old stuff off then to put the new stuff in.