There are two things to consider regarding EVERY flight you make once you have your licence:
1 The paperwork (as I realise you appreciate).
2 You and your capabilities/currency in the type of flight you are considering (as I hope you appreciate – but I have some niggling doubts).
Re 1 The organisation renting you their aeroplane will doubtless have quite a bunch of conditions – some of which you may find quite tiresome in the early days of your career.
Re 2 There are three types of pilot, those who are under-confident, those who are over-confident and those who are about right. Think about that please. If you are serious about popping over to Germany from Ireland as soon as you get your licence (and not just treating it as an example) then I would feel you have more to learn than you realise. I hope that is not the case but if it is then you are well over-confident . Which is dangerous.