It is important to establish a professional relationship so that the individual understands that although you would like to help them, there are professional boundaries that must be maintained.
This can include things like disclosing information that has been told to you in confidence for safeguarding purposes and not meeting up outside of work. The difference between personal and working relationships can be found here.
Initially some individuals may not want to have a relationship with you at all – they may be disengaged or confrontational. It is important to work hard on these relationships and over time build rapport, common interests and trust to increase the efficacy of the support that you provide.
The more time you spend with an individual to help and support them, the more trust you will establish and this will pave the way to the individual being more accepting of any ideas you have to help them to manage their behaviour.