[OSM-newbies] Raw GPS data in JOSM

[Bob Hawkins]

I am steadily learning the art of data creation in JOSM, and enjoying it for the most part.
I understand that I should not convert to the Data Layer or upload to OSM a .gpx file that I have opened.
However, I feel there are occasions when there would be less work than adding new nodes and segments if I could simply remove certain nodes that are incorrect or surplus to requirements in the .gpx layer and create ways from those remaining.  Is this possible?
On a similar subject, when adding nodes over an opened .gpx layer, is there a method by which a newly added node can be 'snapped' to a point in the .gpx layer?  I imagine not, but I find the crosshair too crude to carry out this task with any accuracy - zoom in and the two points are some distance apart, yet one cannot realistically execute work zoomed in to such an extent.  Similarly with the 'tool' (I can't think of its proper term) of a diamond with four squares in it, or four NSEW arrows, that is activated by the 'Select, move and rotate objects' button.
What tips do experienced users have?
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