You can totally use the electric pump to siphon out through the dipstick. This will not replace the filter, etc. When I was typing my reply you were posting your full fluid method. That WILL work as indicated. Do the procedure posted on allpar - follow to the letter and it will work, changing the filter at the same time. Odds are your tranny issues will go away when you do this.
Looking to trade for an early 1988 Honda CRX HF (Pillar mounted seat belts)
Even if you don't intend to drain-fill regularly, a drain bolt beats taking an ATF shower by dropping the pan. Whoever thought it was a good idea to not provide a drain bolt on automatics should be drug out into the street and shot.
By making regular maintenance either difficult (no drain plug) or expensive (Dealer or other service shop) they expect you to either pay to have it serviced, or just drive it into the ground and buy a new one.
By the way, should I worry about applying any RTV sealant or any type of liquid sealant when re-installing the pan w/ new gasket?
JUST a little(a few dabs) to hold it on the pan(unless you have a hard plastic one). it burns me to see someone skip a gasket and apply only sealant. takes a lot of scraping when a gasket makes a better seal and is less time consuming!
I actually don't use RTV anymore... I just put a thin film of wheel bearing grease to stick the gasket down. Changing the gasket is a breeze, it just peels off, wipe off the old grease with a paper towel, and you're ready to go.