I just got done with my first run of tren. I, like you, couldn't acquire the test so I went ahead and ran the tren alone. I started slowly at 35 ED to test my reaction/tolerance. I found that I tolerated it very well after about 2 weeks and bumped to 50 ED which seemed to be a good spot for me. The tren alone still worked very well, although it did effect the libido some. I ran it for 6 weeks and the only effect I had that I didn't enjoy was the lower back pumps which began happening around the 5 week mark. It was so bad during one of my leg workouts I had to cut my squats short.
I felt it worked pretty well and will be running another cycle for 8 weeks once my 6 weeks off is up. If I can get my hands on some test I'll definitely throw some in to combat the libido issue though, but I didn't find it mandatory.