I hope he makes it, if he doesn't manage to get through the first period we know how it goes in these teams, to be replaced it will take very little and above all he must not give in to the pressure that the newspapers and all the commentators ready to defame you will put on him, he must stay focused and do his job, even if it is not easy.
Managing Real Madrid is not an easy matter because it is an elite team and of course the demands from the owners and fans are certainly high, but I am sure Xabi has realized this since Real Madrid's proposal was accepted and the reason he left is because he knows that with his skills and also the current Real Madrid squad, he is sure he can present at least one prestigious title.
It's certainly not easy to coach a team like Real Madrid, which naturally carries a lot of pressure. Coaching a team of Real Madrid's stature requires consistent performance and consistent performances. But there are also advantages, too: Real Madrid is known as a great team, and their mentality is undeniable, plus they have many star players. If a coach can cultivate the potential of each player and maintain a conducive dressing room, coaching Real Madrid will be easier.
This was the case with Zinedine Zidane at the time. We know Zidane didn't have much experience coaching Real Madrid, but his success with Real Madrid was due to his adeptness at managing player potential. Likewise with Xabi, he must have come to Real Madrid with careful consideration. I think Xabi can manage a team as big as Real Madrid, especially since he already understands the goings-on within Real Madrid, making it easier for him to build a strong team to face La Liga and the Champions League next season.