The carrier bearings and 1 pinion bearing are pressed on.A dead blow's not going to do anything for removing them and installing those bearing via bead blow will take forever and damage the bearings.
You make setup bearings using the current bearings you already have installed in the diff unless you already made a set from another gear install.You grind just a little of the inside of the inner race so you can slide the bearings on/off easily(can not have any play though) when setting gear pattern which may require you to remove/install shims many times.
The oven is to heat the ring gear to about 250 degrees to expand it some to make installing it on the carrier easier since it's a zero clearance fit.
Granted they are doing a D60 but the same applies to the D30A,almost all applies to the 8.25 besides no shimes used on the carrier bearings.
http://www.pirate4x4.com/tech/billavista/Gear_Setup/