I'm a senior in SLP at UIUC so maybe I can help! I would say finish your psychology degree first. It will take way too long to switch it up and get an SLP degree. I switched from biochemistry to SLP after my first semester at UIUC and was able to graduate in 3 years (2011-2014). What I would did is take SHS 120, SHS 111, SHS 170, and SHS 375 along with your psych classes. SHS 120 and 170 are required classes that you can typically take without being in the major. Try to get a minor in SLP! There are not many classes (like 18 hours) and I think it'd be really helpful if you can fit those classes in! I would also apply to volunteer at Carle hospital in the CHAOS unit. I am graduating in May with a 3.8 GPA and LORs from top professors, and a pretty decent GRE score and am very nervous that I will likely not get in to many schools. I would apply to grad schools for SLP during your senior year. Also observe SLPs, in the major we need 25 observations to graduate, so getting a start for grad school will help. Good luck and let me know if you have any questions!