I'm on Arcanes boat. Changa it is.

1:1 dmt:herb with a small amount of harmalas [200-300mg] per each gram of dmt used.
Hard to mess up, and if you have a decently sized bubbler/bong, it can get you where you're wanting to go..
The little bit of harmalas added make sure the breakdown of dmt isn't so rapid, allowing it to sit up there for a bit longer, so the potential for a nice buildup of tryptamine is high, allowing a fairly effortless transition [sometimes tooo effortless].
________________________________________________
For just freebase, look into the glass vapor genie [brutal delivery method for freebase; many here use it]. Or the sandwich method with a smaller bong - can brutal also.
Also this method for freebase above ^ - taking a small bit of harmalas [40-50mg] sublingually/orally 15 minutes or so before smoking can be very effective as well.