When Edward VI became King in 1461, he had to deal with some unfavourable circumstances. Edward had not executed his enemies; Henry VI, Prince Edward, or Margaret of Anjou, so they escaped to Scotland. This provided an alternative King for Edward's opponents to support. He was also a usurper to the throne, therefore the majority of the nobility that were still loyal to Henry VI could use this to their favour. Additionally, Edward did not control the distant parts of the country, especially the North of England and Wales. The Kingdom was extremely divided. There were still Lancastrian castles in the Midlands that needed to be captured and/or destroyed. His government was also in severe debt. Considering Edward's age and inexperience, it was unlikely he would be able to deal with this situation effectively and provide the best possible outcomes.
However, some circumstances were actually quite favourable. Although he had to deal with a difficult situation, it would be practically impossible for Edward to do much worse than the disaster King who reigned before him, Henry VI. Edward had also proved his military credentials as a warrior King at the battles of Mortimer's Cross and Towton, showing he was not as incompetent a leader as Henry VI. He was also an ideal candidate for kingship because he was both tall and charismatic, and although he was a usurper to the throne, he was technically the strongest claimant.
The beginning of Edward's first reign can be considered reasonably successful. Edward immediatly destroyed the remaining Lancastrian castles and tried to strengthen his power base by allowing a selected number of the nobility to help him, including Warwick, Montagu and Herbert. He also ordered the execution of the Earl of Oxford and his son after he discovered plots to kill the King. Then Edward, marched his army north where a Lancastrian- Scottish force invaded England, and defeated them.