Ok, I'm from the UK and have been on methotrexate over 5 years, 25mg in tablet form once a week (which is considered almost too high an oral dose). I have always gotten my tablets from the pharmacy and taken them myself at home, and every pharmacy I've ever been to has had it and thats in at least 3 different towns/cities over the UK, I wouldn't have thought that the injections could be that much more toxic then the pills? Maybe you can get them from the hospital pharmacy? I'm not sure how big the difference between oral and injected methotrexate is but anywho this is what i've experienced on it
As for the liver damage, for the first 6 months at least you should be having a bloodtest every 2 weeks, this checks among with loads of other things your liver function and things like your inflammation levels (CRP) to make sure its working and not damaging your body. After about 6 months you then only have to have the bloodtest once a month and if everything is stable after a year then 2 monthly. Now I'm at uni my doctors are happy for me to have them about every 3 months when I'm back home as everything has been OK for such a long time.
One other thing is I drink on methotrexate, and obviously as you can imagine the sort of drinking we British students do is phenomenal. I originally thought that I couldn't drink on methotrexate until one day before my 16th birthday I was at my GI's office and threw a wobbler (was coming off steroids and extremely emotional and whiney lol) and said something along the lines of "and I can't even have a drink on my birthday!!" to which my GI told me it wouldn't do any harm to have a couple, he was just very concerned about me leading a normal life etc. and said that as long as my liver function did not deteriorate then it was fine to drink (obviously he meant in moderation lol). And obviously I didn't go out and get drunk straight away (not that I'm approving getting drunk!) I built it up gradually and now I probably drink the same or more as other people I know (in other words too much) and my liver function is still OK. The thing is to test yourself and build it up slowly if you want to drink, and don't drink for 24hours after you've taken methotrexate as your liver already has enough toxins to deal with without you bathing it in alcohol, this I find just makes you be sick and if you do stomach it will probably have the worst hangover ever the next day.
Sunbathing, I'm a fair blonde but have done several beach holidays since being on it but usual sun safety should apply anyway but I have found I'm no more sensitive to the sun then before.
My hair did thin out a fair bit to begin with but its OK now still quite fine but doesn't fall out anymore.
Everyone is different of course but if you want to drink and stuff just be sensible and make sure you have regular bloodtesting to make sure you're not damaging your body, the last thing you'd want would be liver damage or anything as well as Crohn's!