I have had recent success with WBTB but this is not viable in the long run as I share my bed with my wife. I need to develop DILD and ensure that I regularly complete reality checks in order to perform them in dreams more often.
For what it's worth, I share a bed with my wife as well and employ WBTB for the great majority of my lucids. I can't use alarms or anything, so I've had to try to form a habit around WBTB. Getting to bed early helps. When you're first forming the habit of waking in the very early morning, drinking some water pre-bed helps ease you into the process. Just resolving to be more aware and to wake up after your dreams helps, too.

I also can't help but feel I'm trying to dive straight into the deep-end by trying to find my DG straight away by summoning/teleporting - am I better off doing some training first, Rocky-style? I was hoping to find my DG and let them do the teaching!
I say just try to get lucid as often as possible! Don't get too hung up on whether you can meet a particular goal, but if shooting for the stars motivates you, cool!

A good starter goal I recommend is to try cranking up dream vividness as high as it can go. Check something out in great detail and see what your brain can produce. It's a truly mind-expanding experience and you just never look at dreams the same way after that. And of course, flight!

But honestly, go for whatever you find motivating. There's no better way to learn than to simply have lots of lucid dreams IMO. Good luck!