To fully enjoy and reap the advantages that microdosing can provide, you have to be a bit like a scientist, accurately testing and monitoring your dose until you find what works best for you.
Accurate measuring
The first step towards finding the dose that works best for you is to know exactly how much you are ingesting, which means you need to learn to measure your dose accurately. Knowing the initial dose that you consume will help you work your way up or down, finding your threshold.
Once you have the means to measure accurately, you can prepare your doses. The rule of thumb is to start low and go slow. Generally, people are advised to start at a 1/10 of a regular dose of both psilocybin mushrooms or LSD, but in my experience such a dose can potentially be too much, especially if you are sensitive. My suggestion is starting at 0.025g of psilocybin mushrooms or 0.2μgs LSD. The magic lies in the fine-tuning. You establish your baseline, and then next time you dose, you increase it incrementally, 0.25g of psilocybin mushrooms or 0.25μgs LSD, and observe how the experience changes.
Self-tracking
The next step is to self-track. You should write down the amount that you microdoses and recount any observations. Ideally, after using this system for a couple of weeks, you can find the right dose for you.
Fine-Tuning
The practice of microdosing is defined by taking sub-perceptual amounts of psychedelic substances to enjoy their many benefits without having a psychedelic experience. This means that when you fine-tune your dose by increasing it bit by bit you will find your threshold for a microdose. If you are not careful your microdose could turn into a very mild psychedelic experience. There are a few signs that you have taken too much and exceeded your threshold.
Here are a few signs that your dose might still be too big:
You have a headache
Your eyes are dry and a bit red
You feel famished, even though you just ate
You feel exhausted at the end of the day
You are lightheaded
Your sensorial perception has changed
If your dose is too big, you might want to purchase a very accurate scale and re-measure your daily intake.
This one is the one I use: