replacing rod bolts

Thanks guys!and not to start a fight or anything,but have any of you replaced them before during a rebuild?There are devices to hold the rod and cap together while torqueing the bolts...could you use this to replace the bolts?Or-leave them on the crank and tap one out at a time,reinstalling new ones as you go?The engine is apart at the moment...guess I should measure the id of the big end,get bearings and install on crank,do the bolts one at a time and torque them up.Then remove and remeasure the id.IF I start giving stuff to the machine shop to do,then I'd put in new rods,which means new pistons and boring the block.'Course then you may as well throw in a 4.00"" crank which means better heads...so you see how this all snow balls!Bob