Blowjobs

So I’m fairly good at giving head, I’ve only ever done it to circumcised dicks though. Is it the same for uncircumcised dicks? Might be a stupid question but I’m serious , is there any tips or tricks I should know about ? Or shall I just do it the same way i normally do ? Lol no hate please, I’m seeing a guy that is uncircumcised and he wants me to give him head and in all honesty I’m a bit nervous