Whipping as Chef suggests is pretty controversial, as some swear by it and others swear against it. I've been taught not to whip during the initial heat purge, as this actually traps the tane in the product.
Here's some tips from someone who's done a bit o' work:
* Make sure to use glass tubes. Ffs, don't use pvc or galvanized metal tube, as you're spraying a heavy solvent under pressure. Glass is totally non-reactive, whereas these other materials certainly are not. I'm not even a fan of stainless steel. Also, everyone I've talked to who's tried the $1000 Tamesium Extractor has given up on it and gone back to $30 glass tubes.
* Work in small batches (2-3ozs of trim or less per run). it purges so much more efficiently, trust me
* Make sure there's NO moisture in the tube, and that the trim is dry. Tane + H20 = Ice = Cracked tube
* Harbor Freight sells a nice pump for $150ish (I think it's rated 3cfm) which works great
* Get a razor window scraper. A quick look on Youtube at some vids will show all kinds of moronic rigs people have devised to scrape. On a related note, talk to the hardcore wax-heads at your local wax dispensary, and you'll hear plenty of tales of hideous cuts, nerve damage, etc. Use a little common sense!
* I personally scrape with a candle: I use the candle to heat the blade between scrapes, which makes the wax easier to scrape. This may or may not affect the turpenes, but it is DEFINITELY safer, and I'd gladly sacrifice a little taste for safety. Also, this enables me to get product off the blade without (shudder) using another blade to scrape cold product from the first blade.
* Other essential items: latex/nitrile gloves and rubbing alcohol. If you touch the product with bare fingers, the product will stick and make a mess. Wear gloves to avoid this. Also, keep alcohol on hand to clean tools after your done. It's amazing how effective simple alcohol is