In the world of modular synthesis the weird thing is that making something new from modules you understand is almost always easier than using something you yourself made long ago! I don't understand any of the things I made in old version of Usine before I bought a Gold license!
The beauty behind Usine is that, once you know what you want to do there almost always a way to do it, unlike in most DAWs.
It's spoiled me - I was trying to help an MC recently with his hardware-bundled "lite" versions of Pro Tools and ReWired Reason. We hooked my Trigger Finger up to the Redrrum drum machine in Pro Tools, got it to trigger the Reason module... and you couldn't change the hard-wired midi assignments to the drum pads the way I'd assume you could in Reaper or Usine. I think of everything in terms of Usine modules now, where anything can be changed to anything else you'd like... somehow.
The trick is figuring out which modules will do what you'd like.
So oftentimes stepping away from the machine and designing on paper or in your head what it is you hope to accomplish, then looking at the manual and deciding which modules you think will accomplish this goal is the key.
Ask: Is this for live Fx mixing?
Is this for writing a midi score to link to a virtual instrument?
Is this for live instrumental triggering via a hardware keyboard or somesuch?
etc.
And then, when you get to the nitty gritty details of it, if you have a question ask here. For instance I'm always being driven nuts trying to create odd ways to constrain the parameters of a midi knob on my hardware controller so that it'll only send out a certain range (of the 0 to 127 possible) of values to a midi CC#, say... modwheel. But the plug-in parameter I've latched it to is, say, a delay feedback knob. I know that for a live performance I'll only want it to go from 65% to 95% of the value, so I try to set a math module to make the lowest value correspond to 65%... it takes math knowledge, and I'm working on making some easy to use algorithms where you can just plug in the numbers and get the output values you should assign to your math filter that anyone can use without too much trouble.
Course, you have to know what you want to make. Plan something out, and see if you can make it, and that's a great way to learn.
Here's a link to the Gersic Wiki on DSP (digital signal processing)
http://dspwiki.com/
which might help you a bit
Wikipedia is your friend when learning what the digital music jargon means, too.
Here's the KVR audio forums that I haunt constantly and am more than happy to field any questions, no matter how dumb they might seem to you, any time I'm around. Anyone can feel free to private message me with any question they'd like, anytime. I assure you I knew nothing about any of this 3 years ago, but insomnia and a long attention span are my secret weapons.
http://www.kvraudio.com/forum/
Stick to it and you'll never believe what's possible with digital music on a PC now.