If you don't wanna use lye (although I highly recommend lye), go to woolies and buy washing soda (sodium carbonate. Near the washing powder). Naphtha can be bought at bunnings (shellite, it's near the paint). The rest is fairly self explanatory.
You can try the phylodes, but ime (and I've done a lot of testing with natives) you'll get a negligible yield. Root bark is a much better option.
The method is not that complex, although many people over complicate it either through lack of understanding or poor communication. Basically, the method is;
Acidify: Cook plant material in 8-10 volumes of aqueous solution of pH 2-3 (read: 1:4 vinegar:water) for 2-3 hours mixing occasionally
Base: add base to the resultant soup such that the pH reach 12+ (30g/L of lye will get you there. You'll need more like 150g/L of na2co3, which you have to add slowly because it will release co2 upon neutralisation). Give this solution a good mix every 5 minutes for an hour or so.
Extract: add 50mL of naphtha and gently (but thoroughly) mix into the aqueous solution. Allow to separate and repeat 3x. Remove naphtha layer with a syringe, sep funnel or baster and place into your evap dish. Repeat 3 more times (giving you 200mL of alkaloid laden naphtha, if extracting from more than 100g of bark, use 200mL/100g)
Evap: place your dish naphtha in front of a fan and allow to evaporate.
Result is a crude product containing DMT and other alkaloids(assuming your input material contained DMT).