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Thanks - I think I'll give it a go. I've done a bit of youtubing and the front bumper has to come off for the intercooler, which looks a bit of a faff, but once off it seems like there's decent access. The manifold seems to be all about hidden / awkward to find bolts, whose location I now know, so maybe that'll be easier also.
Finding a workshop manual seems tricky though - apparently Haynes thought that the ST was sufficiently similar to the other Focuses that they didn't make one for it... I guess the small difference of the big turbocharged engine was deemed irrelevant! Might be a Volvo one available that'll be useful
The place I linked apparently has mechanics available to rescue me when inevitably my car doesn't start at the end!
There are surely more RS and STs with mods than not, so I guess loads on YT. Generically speaking reasonable jobs, main issue with manifold and intercooler is usually access not tooling, what other parts require removal? Of course springs require clamps etc.