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You absolutely will hit a wall: this would be natural occurrence for ANY skill you’d try to learn as you are not only learning theory but also dealing with muscle memory and, potentially for some, physical limitations,
Don’t doubt the process just stick to your plan and speak gently to yourself as you would a friend or family member who is trying to learn a new skill.
Mix up your practice session times to split them across shorter times during the day if that works for you…for example this morning I drilled moving from D to Bm then practiced D to D7, F#m, G, A and also practised A7, Dsus, Dm, D, Dsus4…I’m about to practice now and expect that for – some of those chord changes – it is going to feel like starting brand new but I also know if I keep chipping away at it I’ll get there.
Don’t worry about your Mrs hearing mistakes but if you really feel self-conscious just try to practice when she is out of the house or go to a spot far enough away to give you some privacy.
Best wishes, persevere and KEEP GOING!