Hi,
I am a second year law student at the University. PBL consists of two problems in first year and one in the second year. You work together in your 'mini law firm' to break down the problem that you are given in order to establish learning outcomes. You each individually research the outcomes and these link in to the lectures that are given that week. During the PBL session everyone takes in in turn to be the chairperson and the scribe. This may seem daunting if you are an introvert but I can reassure you that it is not just you. Your group will understand that everyone has different personalities but as your relationships with the people grow you will become more confident- trust me. I was daunted at the process and like you did not fully research the approach but I was open to new ideas and everyone is accommodating. Generally, you get given the problem and work through it and this is supervised by a 'tutor.' The tutors are generally practicing solicitors, PHD students or someone who has had experience in the legal sector, such as the Law Commission. They guide you through the process and you initially have a lot of support from them and then this support decreases as you get used to the idea of PBL. As I said previously the problem links in to lectures that you have that week. Also, half way through the week your firm will meet and have an 'interim' session. These sessions make sure that you are on the right track with your work and the interim tutors tell you what key facts, cases, legislation etc that you have missed. You do not have one leader within the firm who organises the rest of the firm as PBL is very much focused towards group participation but do not be daunted by this. Also, do not be afraid about the PBL process and working as part of a team as support is provided and you can still get a lot out of the sessions without contributing every five seconds.
Also, you work together as a firm in Legal Skills where you negotiate, draft documents and in second year 'go to court' with another party. Employers love the PBL approach that York has adopted as it is very unique and you get to establish many key skills that employers look for when recruiting. The main thing that I want to stress to you is do not be worried that you may not fit in. The firm that you are put in will understand that you are apprehensive and the tutors will see that too and will support you. Yes you are working as part of a team but this is not constant as you do not always have to contribute and you also have lectures and that breaks up your time. Another bonus to working in the law firm is that you do not have to be worried if you miss out information as this will be picked up on in the sessions and you will then be able to go away and research it. This is especially helpful if you have not found everything yourself for the problem due to other commitments.
If you have any further questions about PBL or just about York in general do not hesitate to message me.