If your talking about injecting 1-test that could be a painful experience. THere are hints of injectable versions coming but haven't heard anything for sure yet. Other than that search around there are a few articles talking about combining tren and 1-test. Most of which say to skip the 1test, to similiar to tren. So 4-ad would be the preferable option there, and you can inject it pain free.
By the way not to be rude but you may want to learn move about steroids before going and injecting yourself. I could be wrong but I am not sure that a test prop powder is even available. I'm sure to some pharm. companies but haven't heard of a bro using it. Test prop usually refers to a premade variety.