I have a plan - please don't judge me on that

I want to include a jQuery library to slightly alter the DOM of TM1-Web. However, the whole dojo-business is over my edge. I only know some basics of jQuery and how to change a div here and there.
To load jQuery (or jQuery UI or anything) I would usually call it with jquery(document).ready(...). However, with the whole DOM created after the document is ready I am still looking for a way to call my DOM modifications.
(I would only like to add some update-proof things like a logo here or an extra text-line there)
Thank you very much

Regards,
Konstantin