Hi Catfrog I did IVF almost two years ago - my DD just turned 1 and we were so very lucky to get her on the first try.
Only you can decide if taking on a job in another city whilst doing IVF is too much or not, so I'll just outline what my experience was like in case it helps.
All the tests (bloods, HSG etc) was done over the course of a couple of months, mainly because I had to do a number of blood tests and of course had to wait for the right time of the month. These weren't too onerous as were mostly done at my GP / local hospital.
However, once I started my injections I had to go to the clinic every 2-3 days for a scan to check how I was responding to the treatment. My consultant told me the average cycle is between 12-16 days; mine took 18 days. Once my eggs were of sufficient maturity, the extraction was scheduled for (IIRC) 48 hours later.
I chose my clinic as it was 10-15 minutes from home by bus, and I could then take the tube to go to work. I also managed to schedule all my scans first thing in the morning, so that I could get to work at roughly my usual time (I did not tell work I was going through IVF).
The thing about IVF is that you could be expected to go to hospital for extraction at any time from about a week after you start injections. My DH had to go to France when we did this, and I remember having a heated argument with him about when exactly he could go!
I think partly because of how I managed my appointments and work I didn't find IVF too stressful. Also my body seemed to cope quite well with all the stimms, so I wasn't overly tired or emotional but I know there are people who find the whole experience incredibly stressful, and I think you won't know which you'll be until you start. For that reason I think it's worth making sure that you are as relaxed as possible before and during your cycle.
Please feel free to ask any questions, IVF can be so hard. And good luck!