tbh, once i got the proper trim removal tools and asked everybody every question i could think of...yes
trim pries off, undid 4 torx screws, slid stereo out
there was 1 big plug and 2 ariel connectors, pulled them off
the RNS510 went back in in the same way, except the 2 ariels didnt fit side by side anymore, but have since learnt that you can take the plastic off of them and they will - i just plugged the fm one back in by itself.
the gps arial was just another plug and then fed the reciever block up into the dash area.
done.
i really mean it when I say if
I can do it
anyone can
and a big thankyou to those that nursed me through it