Thanks Piezoe for your kind words. My 9th grade English teacher was awesome and one of the teachers who had a major impact on me
The way I add a new idea to my trading plan pretty much follows this route:
First, I notice a certain price action pattern that seems to repeat. (This doesn't necessarily mean a fixed chart pattern like a 1-2-3 pattern; it could be something more nebulous like trading a range.)
Next, I "eyeball" previous occurrences of the pattern and think to myself, "There seems to be positive expectancy in this."
Then, if the "eyeball" analysis is enticing, I then come up with a rough plan based on that informal analysis and I put the plan to the test by logging the result of every appearance of the pattern on a spreadsheet. Since I'm an intraday scalper, I like to compile 3-4 weeks worth of data.
This step is important because I have a tendency to see all the instances where an idea worked and perhaps I overlook the instances where it fails - confirmation bias. Hard stats give you a clearer picture.
Finally, if the stats are positive with an even R:R, I write up a set of rules and then "paper" trade the setup for a while. This helps me determine how confident I feel with it in real time at the hard right edge. I usually compare an even R:R to a positive R:R during this phase to help me decide whether to scalp for smaller profits or hold for larger ones.
There's a range tactic I tested this weekend and am now paper trading. In the past it's taken me at least a couple weeks to get comfortable enough with a new tested idea to take it live.