1.) *EDIT* Glass turkey basters work best, but HDPE turkey basters work too.*End edit* They take some damage when dipped in muriatic acid

, but one turkey baster can make it through several extractions at least.
2.) SWIM doesn't use ammonia and just recrystallizes after extracting, so he doesn't have the experience to compare the ammonia wash to recrystallizing. However, he imagines that the ammonia wash takes less time but loses more product, while the recrystallization takes more time but gives a purer product with a higher % yield. Either way, it is highly inadvisable to smoke your first snow globes without cleaning them up a little bit. You might even find that crystal growing is pretty fun.
Safety advice:
Be careful when working with the lye; it is by far the most dangerous part of the procedure. I weigh mine out and mix it into solution in my shower because I can spray the whole area down with water afterwards (or just take a shower). If even a single pellet gets stuck between your clothes or in your eye it can cause some serious damage. Do you remember the chemical burn scene from fight club? This is the chemical that is being used. Please respect the power of this substance and be careful, dude. /endrant
Yield advice:
The best way to ensure that you end up with snowglobes is to maximize the temperature of the mixture at the time of separation (Keep the jar warm during step 5; partially submerge the jar in hot water). It's the same idea as with recyrstallization; a given volume of solvent holds more solute at higher temperatures. So the warmer the naphtha is when you mix it with the dissolved bark, the more spice can move to the naphtha. The article mentions that the naphtha can be heated on the last pull to increase yield, but it also mentions that MHRB quality has dropped. My rationale is to heat all your pulls and simply clean up the product afterwards.
If you need something explained more concisely or elaborately please let me know and I'll do my best to help.