I entered on a working holiday type visa (12 months, no employer restrictions) and then obtained my PR (although through a different catagory). You may find some employers unwilling to hire you for a full time position, as it is clear that your visa runs out in a maximum of 12 months time, so things like some management positions etc they may be reluctant, especially given that there are a lot of hospitality courses within Canada producing skilled candidates - however, for seasonal jobs, jobs with higher turnover etc, or though an agency, you should be fine.

I know the skilled worker program changed as of July 1st, so check the new rules and restrictions, especially whether you can apply 'in country'. I believe there is now a 'cap' of skilled worker in each catagory, 500 per, and the application year runs July1 - June 30th, so timing may be important too to your decision (aiming for your application to hit July 2nd basically (July 1 is a holiday so no post!) ) There also used to be a cap on the number of working holiday visas as well, which for the UK runs Jan 1 to Dec 31, so again, timing may be key.

There are some rules around the various ways of applying that mean if you leave the country, you can be deemed to have abandoned the process, some there are no such rules, so check. Also, after 12 months are up, if your PR process has not gone through (and I have no idea what waiting times are going to be based on the new system), you would have to leave the country - overstaying a visa is a bad plan! I actually left, and re-entered as a visitor, which they were fine with, as I could prove means of support (ie, prove I wasn't going to work illegally, and I had enough cash to support myself for 6 months).