A pro!!!! Not on the helix, but with the real thing maybe a little knowledgeable. I've bought a Gilmour preset pack just to get a flavour as to how Helix aficionados do it, and in all honesty the signal chain in the preset pack I've got I think is a bit bloated. A lot of the time the amount of fx he used was minimal, BUT it really depends on the era. early to mid 70's literally a Wah (with the reverse wah switch), volume pedal, Compressor, a powerboost, a fuzzface, and a binson echo, Uni-Vibe into 2 Hiwatt DR103, into 2 WEM Starfinder 4x12s, and also a Lesley rotary speaker. But the preset pack has all manner of reverbs, and EQ going on which I never did with my big rack I've just sold. For Animals era, you have to include an Electric Mistress, a big muff and a digital delay. From 77 onwards he used an MXR digital delay. So the FX would be something along the lines of Volume pedal, Wah (with the reverse wah switch), compressor, Digital delay, electric mistress, big muff, powerboost, Animals era he ran the mistress together with the rotary speaker (by this time a Yamaha) so the end result is a watery sound.
Obviously delay is key for Gilmour, don't be afraid to run 2 delays in series....... He did. Run Like Hell was 2 digital delays in series, one delay feeding into another. It's the only way you'll get that sound right. The preset pack I bought has this song set up differently.... with two delays in parallel which isn't correct but sounds OK as you get a better stereo image.
I intend to use the Preset pack I bought purely as a start, but I am going to alter and change some bits. Check out gilmourish.com it's a great resource... but beware even that site isn't 100% accurate.
Find attached a present from me to the group....... an IR of the Hiwatt DR103 and the WEM Starfinder...... Don't tell ssshhhhhhhhhhhh
HIWATT+WEM STARFINDER.wav