No need to panic about the labels, just treat them with care, if you have them you should wear latex gloves when handling concentrated perfumery materials of any sort. Your naturals should most of them have similar warnings on them now too actually as most are covered by the same EU legislation. If you don't have gloves, take extra care and wash your hands very thoroughly after working with the materials even if you don't think you got any on you and resist the temptation to rub your eyes while you are working.
The indole is very powerful so I would dilute in ethanol to 1% or even less, it dissolves without a struggle. If you are used to doing that by volume with liquids you're going to have to get to grips with weight - I've a blog post on weight vs volume that as well as one on diluting and blending.
Coumarin isn't difficult to deal with, but you will probably have trouble with the musk ketone because it's difficult to dissolve. Most people use benzyl benzoate to dissolve it, which I guess you won't have. In that case go for a very weak solution in ethanol - no more than 5% - even then it's going to take a lot of effort to get it to dissolve. I use an automatic stirrer for those sorts of things, but you could try putting it in a sealed container and keeping it in your pocket so that it moves about with you all day. It may take a few days, but you should end up with a solution you can use.
Hope that helps.