I did my header R&R in around 3 hours total. (2hrs rear, 30 front (maybe), 30 everything else)
Would have been quicker if the upper alternator bolt wasn't put on by some Ford moron using an impact wrench (I broke a ratchet and a socket getting it off

) That took a good 30 minutes alone. I was so pissed!
Mine has the large rear bracket so it had to be moved to get the manifold off.
All I can say is; "I swear by gearwrenches!" ...and I mean REAL ones... Not crappy imitations like the POS fat ones that Craftsman and others make.