"I have the practical and theoretical understandings of the specific research methods and techniques appropriate for my project and field."
You need to be aware of which tools are available for your research. This could cover a range of skill types from experimental techniques, through effective literature searching, use of databases and technical software, to understanding the appropriate experimental design and statistical tools to use for your work.
Being able to select the appropriate tools for your work and then deploy them skilfully, perhaps adapting or developing them to further your research, are essential skills for any researcher.
You can develop these skills through courses run by your School and Department, through your practical work, and by talking with colleagues and your Supervisor.
You can also attend courses run by the Social Sciences Research Methods Centre, Bioinformatics Training Facility, MRC Biostatistics Unit, Cambridge Statistics Clinic, University Information Services, and University Library.