It's not easy because the champions league itself isn't all that friendly especially to new teams and I say this cause of the experience I have seen from most teams like Leipzig, Newcastle, and some others and all have failed to make any positive growth and that's why I don't feel any positive achievement will be made to their champions league campaign, but although am not sure for their Laliga journey but the champions league am sure that they will be knocked out.
Teams like Girona will just come into the champions league for the first time to have experience about the competition and not that they can go that far in the league and eliminate bigger clubs who are already experienced in the field already. Your comparison to Newcastle and Leipzig is exactly what I’m expecting from Girona. It’s a good step for them to be here, at least when they’re opportune to play in the champions league next time, they will use the knowledge they'll acquire now to sought themself out in the next round of the competition. It’s not going to be an easy outing for them for the first time but if they perform well as they did to get this qualification, they can at least qualify from the first round of the tournament.