If you change the title tag you won't lose any backlinks, that would only be if you change the url of your blog and didn't do a forward to the new address.
Other than that you hit it... Over all and over time SEO is forgiving, minor things here and there don't make a difference, and Big G changes its algorithms sometimes hundreds of times a year, so you will never, ever get in perfect, and if you do today, by next week it won't be any more...
Just get as much stuff right as you can now, and move on. As you learn a new thing in the future try it out on a test site, if it works for your set up, use it on other sites.
You'll find a lot of conflicting information on SEO all over the web, and that's because we are all using different set ups, and Big G sees those set ups differently. So, there are things that work for almost everyone, which you should use, and there are thing that may only work for some, and if they work for the way you do them, then run with it, if not, then find the way that works for you.
Just keep learning and trying, you'll find your own techniques and ways to do things, and as long as they make you money, no one can say your wrong

.