Yes, I do love my IM k! :D
IM is DEFINITELY easier than IV...I can't imagine how you would find IV easier! You must have some sort of fear of IM?
IM DOES hurt, not tremendously, but there is a pain aspect that is not present with IV -- perhaps that is your issue?
Whoever said IM ketamine does not give full effects is a fucking moron...IM ketamine gives TREMENDOUS effects...I have IVed it, but never wanted to do it again, I just find IM so much more enjoyable and I really suggest that you go that route as well.
100 mg to start out, btw, is a LARGE dose and NOT recommended! If you have no tolerance, I recommend starting with 40-65 mg IM, depending on how much you weigh. If you really don't want to be cautious, PLEASE at least don't inject more than 80-85 mg (which is PLENTY).
IM is safer (as was said you won't fall into a k hole with a needle sticking out of your arm), and generally more pleasant, as it comes on gradually as opposed to all at once. I find it feels like sinking into a gloriously warm bath (almost-opiate like) when IMed.