We proceeded in such a way that we had already internally decided on a general contractor and then actually pre-selected everything (except for clinker and electrical). For this, we obtained a list of tradespeople, scheduled individual appointments with each, and received advice. We also proceeded in a way that we did not let them show us what they had to offer, but instead brought them what we had in mind. This ranged from specific brands/series to printed pictures from the internet. Of course, this cost us weeks of work, and if we ultimately had not signed there, we would have had to do everything all over again. However, the advantage was worth it to us because, first, we knew whether we could implement our ideas and had a fairly high certainty regarding the costs. Thus, we did not have to plan buffers of 30,000 to 40,000 euros but instead entered the race with a relaxed 15,000 euros. This is how it works with a general contractor if you don't want to have an architect.