Hey congrats on the phasing!!

I phase a lot in my dreams, both lucid and nonlucid. I've never really had trouble with it, but there were a few times where I just couldn't do it. So I thought about it for a bit and this is what I did: I'd put my hand on the solid surface, then veeeery slowly try to push it through. It took a few seconds to start sinking into the solid, but it worked! And the cool part was that because I was paying mich attention to the whole thing, I could feel my hand going through, and I could see it slowly passing into the solid surface. It was quite an experience! So yeah, if you ever get any trouble, try doing that slow thing, I hope it works for you!