Hey! Author of the Spark Inspector here - what would make you more comfortable with the setup assistant? I'd love to get you to use it ;-) You can modify your project yourself, but it's important that the framework is added to the debug build configuration only, and the Spark Inspector's setup assistant makes sure you do this right.
If you drag and drop the framework into your project the way Reveal tells you to, that framework will be linked into Release builds (because of the '-ObjC' flag) - so you could accidentally allow people to inspect your published app!