Japanese knotweed is a good one to start first. You may only want to start with literally ONE drop though, as some have a pretty harsh die off from these herbs - and we don't want you herxing really bad - so do be sure to be detoxing as well.
Once you have gotten to where you can tolerate the one drop without a lot of herxing, add in a second one so that you take one drop in the am and one drop in the pm. Once you tolerate that well enough, you can add in a third drop (2 drops am, and 1 drop pm) and so on until you reach around 5 drops each.
Because these herbs have a synergistic quality to them, you will want to start the other herbs once you are up to a few drops of one herb and doing okay with it. So pick your next herb and start it in the same manner - always watching for herxing to become too much and stopping at that dose if it does until you can lower your toxin loads with lots of detoxing.
We can help you decide when to add and when to stop or hold the dose, depending on how severe the herx is if you aren't sure.