This is how I felt LAST Year, when I sold our home.
It's all how you look at it. First you need to "accept" that this is your new reality. If you are selling the home, then it's because you know that there won't be a future with your STBXH right?
So ask yourself, why do you want to live there? So, that anytime something needs to be fixed you call on STBXH to come? = that's a new. hurt. every.time. trust me. I did that for 1 year. He either was too happy, which pissed me off, or was sad, which made me doubt myself or pissed that he "had" to come over - It always ended up hurting a little more.
When it comes down to the important stuff .... It's just a house. You'll make your new place, a HOME!
So, look at it as a new beginning, with excitement - fake it if you have to, but really it is exciting. You get to pick, decorate and live wherever you damn well please.
I second the opinion, to rent first, then you can take your time looking for your own place, when you are ready emotionally. Plus, you'll enjoy not having to worry about any maintenance, so that you can concentrate on YOU and your healing.