There are megathreads available listing the do's and don'ts! If you're looking for accessible *sources* those are pretty hidden for privacy and safety of vendors, but supposedly there are all kinds of 'clues' in the forum. I have not found many and it is disorienting to figure out on your own while dealing with exhaustion.
If it's method you're looking to decide on, the aforementioned megathreads are the way to go. Some commonly used methods are SN, ligature/hanging (partial or full suspension), Inert Gas, and gunfire. Jumping sometimes but there is room for failure and rescue depending. All methods require proper planning and understanding. Methods invoking poison are typically always fatal if done correctly, but require a lot of research to do so.
My method is via handgun because that suits me best and I have concluded I am not able to access the DN information without expending more energy than I can handle and there is the matter of VPNs and BTC transactions and shipping considerations. Excluding the DN, your best options will exclude SN and other opioid or poison routes. Carbon monoxide could also work with a car. In general, just be very sure you're ready for CTB and don't get too worked up on having everything perfect - CTB is your own life decision, just make sure you don't harm others in the process (especially a concern for guns, which is why specific bullets are recommended (such as hollow point) or to be done in the wilderness/away from residential.