In reply to Zack:
We went and did that section of the Kungsleden in late April, a couple of years ago. You can join the STF at the Tourist Station in Abisko. The huts on this section are all manned with the exception of one emergency shelter. I would book your first night at Abisko, as that does get busy, but all of the other huts, will fit you in as required. While these huts don't all have food for sale (unlike the self service huts of Norway), but they do all have Saunas! We carried our own food for our trip, but did eat in the restaurant at the Kebnekaise fjallstation.
At this time of the year, skis are pretty much the main/only option. If you can ski on a piste, then you will be fine on the whole. My wife had never been on Nordic skis and had about two days on Alpine skis, when we went and she coped pretty well. It maybe worth having a day or two around Abisko to get use to using Nordic skis.
We did the journey in 5 days, but you can split it up a bit more if you wish, as there are two other manned huts, that we missed out. From Abisko tourist station followed the Kings Trail to Abiskojaure-stugorna (15km). Following day continued along the trail but took in the summit of Garddenvarri (1154m), saw fresh Wolverine tracks on the way to Alesjaurestugorna (20km). The next day was the longest and toughest day – white out conditions for the whole day. Very knackered when we got to Salkastugonra (25km). Clear weather the following day, gave some great views, we departed the main track and headed over the sp ht 980m on our way to Kebnekaise fjallstation (26km). Crossing some of the lakes on the way to Nikkaluokta (19km) on the final day proved to be slightly challenging, with the odd wet foot achieved, due to the lateness of the season.
I've just got back from Norway and this is what I carried this time - https://www.instagram.com/p/Bf_FXP9gFee/?taken-by=paulsmith_coach