Test without an ester is shot 30-90 minutes before a workout and used the exact same way as you would use any powdered pre-workout. You get a quick and potent effect from TNE which will not necessarily promote any real long-term effects (IE: This will not pack on lean mass the same way that a blast or cycle of Test does) but rather it gives you a lot of mental focus, energy, and most importantly the aggression and drive to really fuck some shit up in the gym.
In my gym, guys will shoot this or ester-less Tren on days when they've got to work up to max singles or if they've had a really shitty day and want to be mad as fuck at some inanimate objects. Now I'm not saying you're going to shoot a bit of oil in your ass cheek and walk into the gym like The Hulk, but honestly the stuff does help. Tren without an ester is far more pronounced in my opinion but you're not asking about that.
Personally I see it as an anxiety inhibitor more than anything else. I, and my fellow gym bros, lift for specifically max weight and with this comes a lot of pre-lift anxiety. What TNE seems to do is eliminate this entirely by putting me into 'the zone' and not letting me out of it for about two hours or so. This is great, because it'll allow me to load up a bar to what I need to pull or press and then just smash it without ever second-guessing or having to do a nine hour ritual to get amped up. Now, it's all weights I otherwise would absolutely still move for the same amount of reps so don't think this stuff will instantly slap pounds onto your lifts. But, if you go in without the right mindset you could actually fail a lift; TNE or TrNE will help prevent this by not really allowing your brain to slip into that bad mindset