1. You could always pluck a string, and go with that vibration as it rings out and you enter "the space" otherwise i don't really see how it could be "taken with you"
2. Memory is different for everyone, although if you abstain from weed for a day or two before then everything should be more clear in your mind afterwards. Then you can smoke a bong to come back to "reality"
3. I think its possible, in some weird way, as long as you go in with choices or options you have already. For example i don't think the spice is gonna shout "You need to work on the oil rigs!" If this was not already on your list of possibilities. It might though
4.Breathe deeply, write it all down afterwards, and try and apply some MORE humbleness to your life. Everytime
Accept yourself for who you are, and embrace the fact that you just took a mind altering substance.

As long as it is for self improvement / inner work you're good, try and avoid that feeling of "addict guilt" or something (I get this a lot).
Safe travels!
With every great plan comes the pleasure of patience. Take a rest, and grab a suckle off the teat of life!