It could be one of two things: Your wifi signal is not strong enough to maintain the speeds needed to provide a good streaming experience (Netflix is much better at handling low speeds, so it works better). Your actual speed could be low. Connect a computer to your modem via lan cable (preferably) or stand as close as possible to the modem and run a speed test. As far as Channel 9 & 10 not loading, do you mean FTA TV? Do you have an aerial plugged in and is it pointing in the right direction?
Never be afraid to back yourself when trying new things, just always make sure you have 3 escape routes if things go wrong.