However, it is extremely time consuming so these days I'll use SkyDemon, and sense check it afterwards.
Agreed and I do the same now I'm allowed to.
Mine sits on the shelf with my Trevor Thom books - where it has been for the 20 years since I gained my PPL. I have never used it since, and never in the air.
Like it.
I know new pilots leave a substantial amount of their brain on the ground
LOL
I'd not leave the ground now w/o SD on 1 or 2 tablets/phone.
I was thinking more of the OP who is still training by the look of it.
This means he's not allowed to use GPS (or any electronic device) either dual or solo xc up to and including the test flight.
I found that a 'brain-freeze' or 'senior moment' during a diversion could be 're-booted' with the familiar mechanics of the whizz-wheel and certainly calcs. for GS and ETA would 'pop-out' automatically before SA re-emerged.
I still carry one around like a comfort thing!