Hi Craig, your 4.5 will allow you to have a lot of fun, develop some skills and amaze you.
Unless you already have star charts I would suggest downloading Stellarium a free planetarium system that will show you what is up in the sky real time.
Once you get your scope collimated properly some but certainly not everything will be blurry. I started with a 4.5 short tube and when set up properly there is a lot that it will show you from a dark site.
Brian
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