There is no need for a spring compressor. Take off your break calipers (leaving the break lines connected), unbolt or remove trackbar (not sure if the 6030 comes with a longer one), unbolt drivesahft from the front axle, that should enable you to drop the axle enough to change out the springs. If not, you might have remove some control arms. (you will have to do that anyway to replace with the ones that come with the kit.
I installed the RE6200 5.5 inch a good while back and did not need a spring compressor. Start spraying all the bolts on your Jeep with PB Blaster everyday not forgeting the rear shock upper bolts. It can be done with hand tools but air tools make it much easier and faster. I installed mine in a day by myself.