5. Enjoy what you have. Even modest telescopes can show amazing things that 99% of the population has never seen.
As a newbie to telescopes, this is an incredibly important piece of advice. I just purchased my first telescope and because of financial limitations and other hobbies, I won't be able to trade and upgrade to the extent that some here do. I read a lot of talk on these forums by people with tens of thousands of dollars to spend, who will probably tell me my stuff is nice crap, but I did the best I could by doing a lot of reading and researching first, talked to lots of folks, and ultimately bought what seemed to be the best compromise that fit my budget. Moreover, it was something I could carry and set up myself without assistance; a prime consideration because I don't have a really good spot for viewing right out my back door, so it has to be able to be put in a car and taken an hour away on whatever weekend I find I have free. As for eyepieces and accessories, I'll upgrade to mid-to-top-shelf as budget allows, but for now, I'm making do with what I have.
That said, my modest telescope is doing exactly what I wanted it to do. On my first evening out with new equipment, seeing the moon in big, sharp detail out of my light polluted suburban backyard was awe-inspiring, and it was upped the next evening when I found and saw the moons of Jupiter with my own eyes. It is absolutely about managing expectations. I'm a newbie to telescopes, yes, but I've been in the advertising world for far longer than I care to admit and I know that companies put the best spin on things just to sell a product whether or not it is a realistic expectation of what a user will actually experience. I have been reading on another thread here about seeing Messier objects and that visually, they aren't going to be the super brilliant multicolored pictures that are in the astronomy equipment sell sheets, and there is so much truth to that. If you understand that going out, you won't be setting yourself up for disappointment. I was thrilled to pieces to see the dark smudges on dark skies that were nebulae and galaxies on my last weekend out and it was nothing like those "Hubble" pictures represent, but yet... still awe inspiring, because.... GALAXIES! And I can't agree more that my modest telescope is allowing me to see things that 99% of the people don't even know are up there.
Whatever keeps your spark lit, is worth having.