Good morning, honey.
reminds me to remember to breathe.
Breathing is the prerequisite for all thinking processes.
Basically, the complexity in most cases is actually not about the "notary part" of the purchase contract, but rather in the appendices. In fact, in most cases, the land transfer part is quite dull and not difficult at all, even in assessing the legal consequences of concluding a contract. The spice lies in the attached construction descriptions, which very (very) often are appended to the purchase contracts.
The notary cannot (and will not) comment much on the construction descriptions. That is neither his task nor would he (she) regularly be able to do so. This part of the purchase contract is, in my opinion, (almost necessarily) to be reviewed by an expert (alternatively by Payday). The consequences of this appendix are much more far-reaching than a normal land purchase contract would usually be.
Everyone has liability insurance and usually also household insurance. Construction insurance is often taken out as well, because a bad guy could steal a radiator. But the fact that there can be considerably serious (sometimes existentially threatening) disadvantages due to poor construction work is usually deliberately suppressed. The costs for professional support and proper contract review are considered unnecessary, even if one has no expertise at all. These things could also be seen by yourself if you are not completely blind, you don’t need external expertise for that (right, Payday?).
Anyway. Everyone is the architect of their own fortune. That also means responsibility for financial ruin and the loss of all assets.