I also was struggling to find a preceptor and accepted the first one who was willing to take me on. I then had another preceptor email me and was willing to precept me]. I did send her an email stating I needed so many hours I would love to be with her during another semester and asked if I could touch base with her when it got close to that time. Didn't want to burn any bridges because I has such difficulty getting anyone with all the med students taking all the positions. This has been the most challenging experience in the program so far.