Is it necessary...

[Chris]

I recognize there is more coolant still in the engine, so I repeated this process several times.

There should be a drain on the block somewhere. For hondas its on the front of the block just left of the exhaust manifold. You'll need a breaker bar.

I was reading up on how to change the coolant and saw there is a "T Fitting" that goes on the end of a garden hose that attaches to the hoses for the radiator (so you can actually put pressure into the system and flush it out). The reason I'm asking this is bc I was wondering if doing this would save me from draining the block. In looking where the drain bolts are located, they would prob be a pain in the ass to remove. If this garden hose thing is just a reason to spend more money at Advance, then screw it and I'll drain the block...