Am I going in the right direction?

So I recently bought the Aneros Helix Syn Trident (the one that had the best ratings for newbies) and I just got to try it out for the first time this morning. I do have a little experience with this kind of stuff, that being using my fingers a couple of times and some… household objects.

I ran a bath, lubed up and got it in no problem. People weren’t lying when they said once you get it in a little bit the Aneros will do the rest. I laid back and just kinda relaxed for a few mins.

After that I tried flexing my pc muscles (the one that you use to stop peeing) as well as my sphincter. Basically after about an hour and a half, I got my pc muscles to twitch a bunch. Kind of reminded me of heavy raindrops on a roof or like someone was tapping it. I tried to hold it as well as clench and release in a rhythm. At one point it did start feeling like something was building up but I just couldn’t hold strongly enough to continue.

I eventually moved to my bedroom because I was sick of the tub and laid on my bed. This time I was able to put a pillow under my back like many suggest. Again, after maybe half an hour I started to feel like something was building but again, couldn’t keep going.

What I’m basically asking here is “is this a typical enough first attempt”? I didn’t expect anything to happen so I’m not annoyed at all. I’m not going to claim that it doesn’t work after like 2 and a half hours of use. What I’m wondering is did I use it right? Is there anything I can do to better increase my chances of success when I’m not using it? Should I keep going just like this to slowly build up my proficiency with it?