I’d like to hire a pro to hook up a quick release valve to a gas pipe for a portable NG BBQ grill. The pipe is currently capped, rising one foot above ground, no shut-off valve nearby (used to be a pool heater hook-up). Does this sound like a big effort, what would be involved (shutting off the main)? Secondly, is it advisable for me to procure the valve first to save time? If so, I need to measure the external diam. of the pipe? Where would be the best places to purchase the valves? Thanks in advance.