One of the problems with chin-ups is that if you do not do them regularly - or a very similar resistance exercise - then you will not be able to do any. The other problem is having the equipment. Luckily my long suffering partner accepts a gym frame in our front room that I can do them on. Decades ago, when taking our daughter to the local park, I was able to use a climbing frame to build up from simply holding in the up position before very slowly lowering, to eventually being able to do a chin-up. It took several weeks.

Good luck with it Marco. It is worthwhile.