1. No, each application / when you enter, it is based on its own merits and just because you have a PR application is process, does not mean that you will have a hard time. You only have to meet the criteria of entering Canada as a Tourist. See my previous post on this at:
#5,143
Since you do not need a Visa to enter, the process will be the same at the PoE.
2. Currently, anyone in Canada is being issued a COPR which is signed and date, and there is no need to go to the border. All you have to do is inform IRCC that you are already in Canada.