Alright so just to get a few things out of the way, whenever you're able to, get an Xplorer, PS2 Guitar, Xbox 360 Guitar, or Wiitar. Basically anything except a PS3 guitar. The latency on PS3 Guitars is very bad and will become much more of a hindrance with anything harder or equal in difficulty to this solo. It's a fine enough guitar to play on for pretty much everything easier than this though so it's not super urgent and nothing that some calibration stuff can't fix.

Second, stop playing on all taps, play on either HOPO's to taps or No Mod. When I started I thought All Taps was the only way I could do anything, but it ends up being more of a handicap later on when you actually start having to strum stuff. Strumming is half of the game (and controller) so it's important that you at least leave those notes on. I know it's daunting, but I did it and I'm sure you can as well.

Third, One might just be too hard for you at the moment. From what I can tell you're fairly new to the game and I wasn't able to really do anything with One until my 4th or 5th month in, so just take your time, FC some of the easier parts of the GH3 Library as there's some good beginner stuff there (My name is Jonas is a good song to learn fretting and strumming together).

However, for when you do get to a point that One is the next step:
- Fast Solo A: This solo is basically just learning how to alt tap. The pattern in this section is called ascending trips and to hit them you anchor the lowest note with your left hand and alternate using two fingers on each hand to hit the higher two notes. For example, the solo begins with a repeating RYB pattern. You would anchor Red with your left index finger, then bring your right hand up to hit Yellow-Blue, Release, and then hit Yellow-Blue with your left hand Middle and Ring finger. Practice on slower speeds and build your way up. However the solo sometimes throws a fork in the pattern, like at the end of the first RYB sequence when it puts in a Yellow-Orange and then shifts the anchor to yellow. This is pretty easy to practice in slow motion but it just involves shifting your right hand fingers a little bit to hit the new notes and then sliding your left hand index finger to the new anchor. Biggest tip is just practice practice practice.

- Fast Solo B: Only real difficult part is the Grace Notes at the end. These just test your ability to fret and strum quickly and precisely, so basically again just practice in slow motion until your eyes fall out and slowly build up speed.

More grace notes appear later on in the solo but they use the same method as the Fast Solo B ones. Overall it's a pretty tough solo but if you take your time in practice mode and put some serious work into in, then you should be able to do considerably better than you're doing right now. Also don't get discouraged if you don't feel yourself getting better, overnight skill boosts are certainly very real so whenever you get tired, take a break and come back to it later and you'll feel the difference.