Some will say to roll the belt on without loosening the adjustments. I strongly recommend not doing that.

The 300D engine compartment is a Bear to work within, but the compressor is not too bad if you work from underneath and from the top. A set of ramps would be really helpful.

There are the three large bolts and then there is an adjuster below the power steering pump that you can use to loosen and tighten the pulley position once the big bolts are loosened.

It's been awhile so I don't remember exactly what ratchets, extensions, etc. that I used, but it seems that I remember it taking nothing more than a ratchet, socket and box end wrench. If you have a few different extension lengths, they might come in handy.

As far as putting the wrenches in place and twisting, we can't help you very much over the internet with that part, but get determination in your mind and a few wrenches in your hand and you'll get through it.

Good luck,