You can also start from indole, as posted here
Post 451545
(Chimimanie: "Thanks", Tryptamine Chemistry) The Indolyl-3-dimethylaminomethylketone gets reduced to DMT via NaBH4 in 1-propanol. I read it may be possible to use another solvent, but no one backed up that thought so maybe not. If you can get SnCl4 (anhdrous liquid) and NaBH4 than your good to go.
The rest is non sketch and easily obtainable.