Same here I only dabble in SEO. I don't think there is a silver bullet that gets you to the top, but here are a few things I do
First and foremost I'd use a keyword tool. Word Tracker and Ubersuggest are both free and can give you an idea of some related keywords for your tags.
Also use google and youtube search suggestions to see what keywords are popular related to your title. Just type your title in youtube or google search and see what drops down.
Secondary you should treat your description as a blog entry, really fill it up with everything related to your video. Fill your first two lines with rich high searched keywords then more onto descriptive stuff. Talk about how old your phone is, why your jail breaking, what are the benefits, etc
If your struggling to fill up that space, write out a transcript of your video. Usually that alone will contain lots of juicy related keywords that help your SEO
Your description should also continue web links to related websites
Make sure you have a custom thumbnail
If you have a blog your website, link and post your video there. As this will help create higher rankings
Like I said there isn't just one thing that effects yoru SEO, Engagement, high retention views, shares etc all effect where your video lands, so upload and share away