Lamba Sensor and Manifold Removal

Week off work so need to sort out and fit a few bits , Manifold swap for one on Franks and at the same time replace the lamba sensor to try and eradicate the hesitation and holding back on full chat , Can i do this in situe or have to remove the rad for access is the lamba a case of a ring spanner ??

Got a sports back box and second decat (janspeed) aslo to do at same time but dont want to be screaming blue murder if there is a simply method/process !!

All advice hugely appreciated ;)
 
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