What other method should I use? I can't think of any that would work
Honestly it depends where you live and your situation, but you should read the PPH.
You can download it here, it has a lot of methods and it describe all of those pretty good.
Personally, I'm looking into salts like SN, they seem reliable and easy accessible and from what i've here lots of people succesfully CTB with it,
if you search through the forums, there are people documenting their last moments, and yeah with salts once you ingested it you can go back, so whatever instinct you have does not mathers which I think is good and why a lot of people choose it.
Hopefully this is helpful. Also, if you don't mind me asking, what makes you want to CTB?